Revert "Work around change in LG "modal" no longer removing dom elements when closed"

This reverts commit 44c8f27.

Author: kraenhansen

packages/connection-form/src/components/connection-string-input.spec.tsx

@@ -236,11 +236,7 @@ describe('ConnectionStringInput Component', function () {
         );
 
         // Wait for the modal to close.
-        await waitFor(
-          () =>
-            expect(screen.getByText('Confirm').closest('dialog')).to.not.be
-              .displayed
-        );
+        await waitFor(() => expect(screen.queryByText('Confirm')).to.not.exist);
       });
 
       it('should call setEnableEditingConnectionString', function () {