Fix: use text color in top layer elements (#882)

* fix text color in modals
* fix text color in popovers

Author: JesmoDev

packages/uui-modal/lib/uui-modal.element.ts

@@ -96,6 +96,7 @@ export class UUIModalElement extends LitElement {
         max-height: unset;
         border: none;
         background: none;
+        color: var(--uui-color-text);
       }
       dialog::backdrop {
         background: none;

packages/uui-popover-container/lib/uui-popover-container.element.ts

@@ -367,6 +367,7 @@ export class UUIPopoverContainerElement extends LitElement {
         background-color: none;
         background: none;
         overflow: visible;
+        color: var(--uui-color-text);
       }
     `,
   ];