src/app: improve style of tags in submission

Improve the style of tags in the submission interface by adding a
slight rounded border like other input types.

src/app/shared/form/builder/ds-dynamic-form-ui/models/tag/dynamic-tag.component.html

@@ -9,7 +9,7 @@
             [wrapperClass]="'border-bottom border-light'">
 
   <input *ngIf="!model.hasAuthority"
-         class="border-0 form-control-plaintext tag-input flex-grow-1 mt-1 mb-1"
+         class="border rounded form-control-plaintext tag-input flex-grow-1 mt-1 mb-1"
          type="text"
          role="textbox"
          [class.pl-3]="chips.hasItems()"
@@ -23,7 +23,7 @@
 
   <div *ngIf="model.hasAuthority" class="position-relative right-addon">
     <i *ngIf="searching" class="fas fa-circle-notch fa-spin fa-2x fa-fw text-primary position-absolute mt-1 p-0" aria-hidden="true"></i>
-    <input class="border-0 form-control-plaintext tag-input flex-grow-1 mt-1 mb-1"
+    <input class="border rounded form-control-plaintext tag-input flex-grow-1 mt-1 mb-1"
            type="text"
            [attr.aria-labelledby]="'label_' + model.id"
            [(ngModel)]="currentValue"