[DSC-2002] restore chips margin

Author: FrancescoMolinaro

src/app/shared/form/chips/chips.component.html

@@ -11,7 +11,7 @@
           {{tip}}
         </p>
       </ng-template>
-      <div role="listitem" class="nav-item mx-1 mb-1 d-flex flex-row"
+      <div role="listitem" class="nav-item mr-2 mb-1 d-flex flex-row"
            #t="ngbTooltip"
            triggers="manual"
            cdkDropList