Updated RNNSideMenuController.m (#2788)

on clicking the outside of the sideMenu area sideMenu not closing,
because there is a problem in the code which i modified now

lib/ios/RNNSideMenuController.m

 	self.sideMenu = [[MMDrawerController alloc] initWithCenterViewController:self.center leftDrawerViewController:self.left rightDrawerViewController:self.right];
 	
 	self.sideMenu.openDrawerGestureModeMask = MMOpenDrawerGestureModeAll;
-	self.sideMenu.closeDrawerGestureModeMask = MMOpenDrawerGestureModeAll;
+	self.sideMenu.closeDrawerGestureModeMask = MMCloseDrawerGestureModeAll;
 	
 	[self addChildViewController:self.sideMenu];
 	[self.sideMenu.view setFrame:self.view.bounds];