UI: Remove macOS-Default Full Screen Menu Item

macOS looks if the NSUserDefault NSFullScreenMenuItemEverywhere is set
to true, and if it is, it adds its own full screen menu item.
Sets this NSUserDefault to false since it defaults to true.

UI/obs-app.cpp

@@ -2674,6 +2674,10 @@ int main(int argc, char *argv[])
 	}
 #endif
 
+#ifdef __APPLE__
+	DisableFullScreenViewMenuItem();
+#endif
+
 #ifdef _WIN32
 	obs_init_win32_crash_handler();
 	SetErrorMode(SEM_FAILCRITICALERRORS);

UI/platform-osx.mm

@@ -235,6 +235,13 @@ void EnableOSXDockIcon(bool enable)
 				NSApplicationActivationPolicyProhibited];
 }
 
+void DisableFullScreenViewMenuItem()
+{
+	[[NSUserDefaults standardUserDefaults]
+		setBool:NO
+		 forKey:@"NSFullScreenMenuItemEverywhere"];
+}
+
 /*
  * This custom NSApplication subclass makes the app compatible with CEF. Qt
  * also has an NSApplication subclass, but it doesn't conflict thanks to Qt

UI/platform.hpp

@@ -69,6 +69,7 @@ void EnableOSXDockIcon(bool enable);
 void InstallNSApplicationSubclass();
 void disableColorSpaceConversion(QWidget *window);
 void CheckAppWithSameBundleID(bool &already_running);
+void DisableFullScreenViewMenuItem();
 #endif
 #ifdef __linux__
 void RunningInstanceCheck(bool &already_running);