fix(context-dialog): Fixes an overflow issue with long content when p…

…ositioning moved to bottom.

At some point the dt-context-dialog-content was the last element if there was no footer and the css selector corrected against the overflow situation with the close button.
After a html structure change, the content was never the last child, as the button was rendered unconditionally afterwards.

libs/barista-components/context-dialog/src/context-dialog.scss

@@ -79,7 +79,7 @@ $context-dialog-top-header-padding: 8px;
 // and there is no footer, adjust the padding and margin of the content.
 ::ng-deep.dt-context-dialog-panel-bottom
   .dt-context-dialog-panel
-  .dt-context-dialog-content:not(:last-child) {
+  .dt-context-dialog-content:not(:nth-last-child(2)) {
   margin: 0;
   padding: $panel-padding;
 }