fix: NoReverseMatch error in quota delete template

[AKRITI-ENG]

Fixes #1404

How I fixed it
Updated the template to use the correct URL pattern name that actually exists in the codebase:

• Changed the URL from "control:event.item" to "control:event.product"
• Updated the parameter from item=item.pk to product=item.pk to match what the URL expects

Testing done
I've tested this locally and confirmed:

• Deleting quotas without products works fine
• Deleting quotas with products now shows the proper confirmation page
• The Cancel button takes you back to the quotas list as expected

Summary by Sourcery

Bug Fixes:

• Resolve NoReverseMatch errors on the quota deletion page by using the existing product URL pattern and parameter.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the quota delete confirmation template to use the correct URL pattern and parameter name for linked products, resolving a NoReverseMatch and ensuring proper navigation from the list of dependent products.

Sequence diagram for resolving linked product URL in quota delete template

sequenceDiagram
  actor Admin
  participant Browser
  participant QuotaDeleteTemplate
  participant DjangoURLResolver as URLResolver
  participant ProductDetailView

  Admin->>Browser: Click linked product name in quota delete page
  Browser->>QuotaDeleteTemplate: Request quota_delete.html
  QuotaDeleteTemplate->>QuotaDeleteTemplate: Render anchor with url control:event.product and param product=item.pk
  QuotaDeleteTemplate-->>Browser: HTML response with correct product link
  Admin->>Browser: Click product link
  Browser->>DjangoURLResolver: HTTP GET /control/event/product/{product_pk}
  DjangoURLResolver->>DjangoURLResolver: Resolve control:event.product with product parameter
  DjangoURLResolver->>ProductDetailView: Dispatch resolved request
  ProductDetailView-->>Browser: Render product detail page
  Browser-->>Admin: Display product detail view

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File-Level Changes

Change	Details	Files
Fix incorrect URL tag in the quota delete template that caused NoReverseMatch when rendering linked products.	Update the Django URL tag to use the existing control:event.product route instead of the non-existent control:event.item route. Change the URL parameter from item=item.pk to product=item.pk so it matches the expected keyword argument for the product route. Ensure that dependent products listed on the quota delete page link correctly to their product detail pages without raising errors.	app/eventyay/control/templates/pretixcontrol/items/quota_delete.html

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1404	Prevent an error page when attempting to delete a quota that has products attached, and instead show the intended confirmation/message page explaining that the quota cannot be deleted.	✅

Possibly linked issues

• Error page when trying to delete a quota tied to a product #1404: Yes. The PR fixes the NoReverseMatch error causing the quota deletion error page described in the issue.

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Pull request overview

This PR fixes a NoReverseMatch error in the quota delete template by correcting the URL pattern name and parameter to match the actual URL configuration defined in the codebase.

• Updated the URL pattern from the non-existent control:event.item to the correct control:event.product
• Changed the parameter from item= to product= to match the URL pattern's expected parameter name

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[Sak1012]

Please update the PR with a rebase

[AKRITI-ENG]

@Sak1012 Rebased as requested