fix: replace router.reload with location.reload

[MuraariK13052008]

What this fixes

After deleting a round, the page never refreshed — the deleted round remained visible in the UI even though it had been removed from the database.

Root cause

Line 194 of RoundEdit.vue calls router.reload() after a successful round deletion. Vue Router does not have a reload() method — this throws TypeError: router.reload is not a function at runtime. Because the error was thrown inside a .then() callback, it was silently swallowed and the page never refreshed.

Fix

Changed router.reload() → location.reload(), which is the correct browser API for a full page reload. This is consistent with the exact same pattern already used in RoundInfo.vue for activateRound() and pauseRound().

Files changed

• frontend/src/components/Round/RoundEdit.vue

How to verify

1. Open any campaign with at least one round
2. Delete a round using the delete action
3. Confirm the page now refreshes automatically and the deleted round no longer appears

Relates to: T415578