UI: help popup button improvements

ui-ngx/src/app/shared/components/help-popup.component.html

@@ -36,7 +36,7 @@
     <button mat-button
             color="primary"
             class="tb-help-popup-text-button"
-            [ngClass]="{'mat-stroked-button': popoverVisible && popoverReady}">
+            [ngClass]="{'mat-mdc-outlined-button mdc-button--outlined': popoverVisible && popoverReady}">
       <span>
         <ng-container *ngIf="triggerSafeHtml">
           <span [style]="triggerStyle" [innerHTML]="triggerSafeHtml"></span>

ui-ngx/src/app/shared/components/help-popup.component.scss

@@ -47,6 +47,7 @@
   padding: 0 2px 0 8px;
   line-height: 28px;
   height: auto;
+  transition: border 0s;
   &.mat-mdc-outlined-button {
     padding: 0 1px 0 7px;
     line-height: 26px;