remove sort by reported trait

Author: ala-ebi

src/app/feature/study/pages/study-search/study-search.component.html

@@ -159,7 +159,7 @@ <h3>Search parameters</h3>
           </ng-container>
 
           <ng-container matColumnDef="reportedTrait">
-            <th mat-header-cell *matHeaderCellDef mat-sort-header> REPORTED TRAITS</th>
+            <th mat-header-cell *matHeaderCellDef> REPORTED TRAITS</th>
             <td mat-cell *matCellDef="let row">{{row?.reportedTrait || 'NA'}}</td>
           </ng-container>