printedparts: show gage lab tag in the catalog list

The list showed the internal auto-minted itemcode; the gage lab works from the
WJRP gage lab tag. Show gagelabtag as the primary identifier, falling back to
itemcode when a row has no tag assigned.

plugins/printedparts/frontend/views/PrintedItemsList.vue

@@ -37,7 +37,7 @@
             <thead>
               <tr>
                 <th></th>
-                <th>Code</th>
+                <th>Gage Lab Tag</th>
                 <th>Name</th>
                 <th>Quantity</th>
                 <th>Bin</th>
@@ -59,7 +59,7 @@
                     class="item-thumb"
                   />
                 </td>
-                <td>{{ item.itemcode || '-' }}</td>
+                <td>{{ item.gagelabtag || item.itemcode || '-' }}</td>
                 <td>
                   {{ item.itemname }}
                   <span v-if="!item.isactive" class="badge badge-secondary">Retired</span>