Fix to CSV import

Fixing a mis-aligned column import for the seatplan CSV import - forgot to increase the index when adding the seat_group_id column previously.

Author: t3rminalV

app/Models/SeatingPlan.php

@@ -173,7 +173,7 @@ public function import(string $csv, bool $wipe = false): void
                 $seat->description = $row[6] ?? null;
                 $seat->class = $row[7] ?? null;
                 $seat->seat_group_id = (int)$row[8] ?? null;
-                $seat->disabled = (bool)$row[8];
+                $seat->disabled = (bool)$row[9];
 
                 $seat->saveQuietly();
             }