fix:iOS13 scrollView.automaticallyAdjustsScrollIndicatorInsets default value YES which make the webview vertical indicator position in wrong offset

ios/RNCWebView.m

 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
   UIScrollViewContentInsetAdjustmentBehavior _savedContentInsetAdjustmentBehavior;
 #endif
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
+  BOOL _savedAutomaticallyAdjustsScrollIndicatorInsets;
+#endif
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
     _savedContentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
 #endif
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
+    _savedAutomaticallyAdjustsScrollIndicatorInsets = NO;
+#endif
+      
   }
 
   if (@available(iOS 12.0, *)) {
       _webView.scrollView.contentInsetAdjustmentBehavior = _savedContentInsetAdjustmentBehavior;
     }
 #endif
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
+    _webView.scrollView.automaticallyAdjustsScrollIndicatorInsets = _savedAutomaticallyAdjustsScrollIndicatorInsets;
+#endif
 
     [self addSubview:_webView];
     [self setHideKeyboardAccessoryView: _savedHideKeyboardAccessoryView];
     }
 }
 #endif
-
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
+- (void)setAutomaticallyAdjustsScrollIndicatorInsets:(BOOL)automaticallyAdjustsScrollIndicatorInsets{
+    _savedAutomaticallyAdjustsScrollIndicatorInsets = automaticallyAdjustsScrollIndicatorInsets;
+    if (_webView == nil) {
+           return;
+       }
+       if ([_webView.scrollView respondsToSelector:@selector(setAutomaticallyAdjustsScrollIndicatorInsets:)]) {
+           _webView.scrollView.automaticallyAdjustsScrollIndicatorInsets = automaticallyAdjustsScrollIndicatorInsets;
+       }
+}
+#endif
 /**
  * This method is called whenever JavaScript running within the web view calls:
  *   - window.webkit.messageHandlers[MessageHandlerName].postMessage

ios/RNCWebViewManager.m

 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
 RCT_EXPORT_VIEW_PROPERTY(contentInsetAdjustmentBehavior, UIScrollViewContentInsetAdjustmentBehavior)
 #endif
+#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 /* __IPHONE_13_0 */
+RCT_EXPORT_VIEW_PROPERTY(automaticallyAdjustsScrollIndicatorInsets, BOOL)
+#endif
 
 /**
  * Expose methods to enable messaging the webview.