[tizen_window_manager] Remove redundant geometry type assertions

getGeometry returns Map<String, int> via Map<String, int>.from(), which throws
a TypeError if any value is not an int, so the values are guaranteed to be ints
by the time the test reads them. Drop the 'returns integer values' test whose
isA<int>() assertions therefore verify nothing; key presence and positive
dimensions remain covered by the other tests.

Author: seungsoo47

packages/tizen_window_manager/example/integration_test/tizen_window_manager_test.dart

@@ -40,15 +40,6 @@ void main() {
       expect(geometry.containsKey('height'), isTrue);
     });
 
-    testWidgets('returns integer values for all geometry fields',
-        (WidgetTester tester) async {
-      final Map<String, int> geometry = await WindowManager.getGeometry();
-      expect(geometry['x'], isA<int>());
-      expect(geometry['y'], isA<int>());
-      expect(geometry['width'], isA<int>());
-      expect(geometry['height'], isA<int>());
-    });
-
     testWidgets('returns positive dimensions', (WidgetTester tester) async {
       final Map<String, int> geometry = await WindowManager.getGeometry();
       expect(geometry['width'], greaterThan(0));