style(userfront): format dart files

userfront/test/runtime_env_compile_time_test.dart

@@ -10,14 +10,17 @@ void main() {
       expect(runtimeOriginFallback(), isEmpty);
     });
 
-    test('BACKEND_URL dart-define overrides runtime origin fallback when set', () {
-      if (_expectedBackendUrl.isEmpty) {
-        expect(runtimeBackendUrl(), runtimeOriginFallback());
-        return;
-      }
+    test(
+      'BACKEND_URL dart-define overrides runtime origin fallback when set',
+      () {
+        if (_expectedBackendUrl.isEmpty) {
+          expect(runtimeBackendUrl(), runtimeOriginFallback());
+          return;
+        }
 
-      expect(runtimeBackendUrl(), sanitizedUrl(_expectedBackendUrl));
-    });
+        expect(runtimeBackendUrl(), sanitizedUrl(_expectedBackendUrl));
+      },
+    );
 
     test(
       'USERFRONT_URL dart-define overrides runtime origin fallback when set',