DropList: Fix list item display

Stretch across the whole line.

projects/common/components/input-elements/drop-list/drop-list.component.css

@@ -56,6 +56,7 @@
 }
 
 .drop-list-item {
+  flex: 1;
   border-radius: 5px;
   cursor: grab;
   transition: all .3s linear;