[editor] Make property input for text a text area

Useful for longer text in textareas and does not hurt short text 
elements (like text-field).

projects/editor/src/app/unit-view/page-view/properties-panel/element-properties.component.html

@@ -163,9 +163,10 @@
                            combinedProperties.value !== true && combinedProperties.value !== false"
                         appearance="fill">
           <mat-label>Vorbelegung</mat-label>
-          <input matInput type="text"
+          <textarea matInput type="text"
                  [value]="combinedProperties.value"
                  (input)="updateModel('value', $any($event.target).value)">
+          </textarea>
         </mat-form-field>
 
         <mat-form-field *ngIf="combinedProperties.appearance !== undefined" appearance="fill">