Revert "Fix error when choose noon on time picker (flutter#78478)" (flutter#79828)

This reverts commit 6dd77cc as it is breaking the build.

Author: darrenaustin

packages/flutter/lib/src/material/time.dart

@@ -91,7 +91,7 @@ class TimeOfDay {
   DayPeriod get period => hour < hoursPerPeriod ? DayPeriod.am : DayPeriod.pm;
 
   /// Which hour of the current period (e.g., am or pm) this time is.
-  int get hourOfPeriod => hour > hoursPerPeriod ? hour - periodOffset : hour;
+  int get hourOfPeriod => hour - periodOffset;
 
   /// The hour at which the current period starts.
   int get periodOffset => period == DayPeriod.am ? 0 : hoursPerPeriod;

packages/flutter/test/material/time_test.dart

@@ -25,24 +25,5 @@ void main() {
       expect(await pumpTest(false), '7:00 AM');
       expect(await pumpTest(true), '07:00');
     });
-
-    testWidgets('return 12 hours at noon', (WidgetTester tester) async {
-      Future<String> pumpTest(bool alwaysUse24HourFormat) async {
-        late String formattedValue;
-        await tester.pumpWidget(MaterialApp(
-          home: MediaQuery(
-            data: MediaQueryData(alwaysUse24HourFormat: alwaysUse24HourFormat),
-            child: Builder(builder: (BuildContext context) {
-              formattedValue = const TimeOfDay(hour: 12, minute: 0).format(context);
-              return Container();
-            }),
-          ),
-        ));
-        return formattedValue;
-      }
-
-      expect(await pumpTest(false), '12:00 PM');
-      expect(await pumpTest(true), '12:00');
-    });
   });
 }