remove iban on buy contracts

resources/views/contract.blade.php

@@ -187,10 +187,12 @@ MwSt-Nr: CHE-226.272.050
             <td>Restbetrag</td>
             <td>{{ $contract->left_to_pay }}</td>
         </tr>
+        @if ($contract->isSellContract())
             <tr>
                 <td>Bankverbindung IBAN</td>
                 <td>CH69 0900 0000 1549 3981 7</td>
             </tr>
+        @endif
         <tr>
             <td>Lieferdatum</td>
             <td>{{ $contract->delivery_date_formatted }}</td>