Revert D19836548: Prevent modal dismissal with swipe gestures

Differential Revision:
D19836548

Original commit changeset: 2b8c80b86356

fbshipit-source-id: c8118f671e2a5e4d2b2f32a704b0cdc227d5c6c5

Author: Shu Lin

React/Views/RCTModalHostViewController.m

@@ -24,11 +24,7 @@ - (instancetype)init
   if (!(self = [super init])) {
     return nil;
   }
-    
-  if (@available(iOS 13.0, *)) {
-    self.modalInPresentation = YES;
-  }
-    
+
 #if !TARGET_OS_TV
   _preferredStatusBarStyle = [RCTSharedApplication() statusBarStyle];
   _preferredStatusBarHidden = [RCTSharedApplication() isStatusBarHidden];