fix(ui_auth): make light text on _EmailVerificationBadge legible (#196)

Co-authored-by: Russell Wheatley <[email protected]>

Author: qwezey

Diff for: packages/firebase_ui_auth/lib/src/screens/profile_screen.dart

@@ -387,7 +387,7 @@ class _EmailVerificationBadgeState extends State<_EmailVerificationBadge> {
         children: [
           Container(
             decoration: BoxDecoration(
-              color: Colors.yellow,
+              color: Colors.yellow.withOpacity(0.5),
               borderRadius: BorderRadius.circular(12),
             ),
             child: Padding(