remove property for safariview

since the property is accessed outside of this module there's no point in having it as property

SafariViewManager.h

@@ -5,6 +5,4 @@
 
 @interface SafariViewManager : RCTEventEmitter <RCTBridgeModule, SFSafariViewControllerDelegate>
 
-@property (nonatomic) SFSafariViewController *safariView;
-
 @end

SafariViewManager.m

@@ -7,6 +7,7 @@
 @implementation SafariViewManager
 {
     bool hasListeners;
+    SFSafariViewController *_safariView;
 }
 
 RCT_EXPORT_MODULE()