remove useMaterial3 (#2579)

This PR removes redundant `useMaterial3` since it is true by default.

Fixes flutter/flutter#162818

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Author: 2shrestha22

compass_app/app/lib/ui/core/themes/theme.dart

@@ -41,7 +41,6 @@ abstract final class AppTheme {
   );
 
   static ThemeData lightTheme = ThemeData(
-    useMaterial3: true,
     brightness: Brightness.light,
     colorScheme: AppColors.lightColorScheme,
     textTheme: _textTheme,
@@ -55,7 +54,6 @@ abstract final class AppTheme {
   );
 
   static ThemeData darkTheme = ThemeData(
-    useMaterial3: true,
     brightness: Brightness.dark,
     colorScheme: AppColors.darkColorScheme,
     textTheme: _textTheme,