Fixes #13341 Clean up correct seats on license delete

Before this, we checked for the `id` collumn in the `license_seats` table, insteasd of
using `license_id` for this.

This way, we ensure that we only alter seats belonging to the correct license.

app/Http/Controllers/Licenses/LicensesController.php

@@ -207,7 +207,7 @@ public function destroy($licenseId)
         if ($license->assigned_seats_count == 0) {
             // Delete the license and the associated license seats
             DB::table('license_seats')
-                ->where('id', $license->id)
+                ->where('license_id', $license->id)
                 ->update(['assigned_to' => null, 'asset_id' => null]);
 
             $licenseSeats = $license->licenseseats();