[iOS] Fixes xcode build error on RN 0.57.0:

> multiple methods named 'goForward' found with mismatched result, parameter type or attributes
in RCTWebViewBridgeManager.m, line 89

Changes match other RCT_EXPORT_METHODs, like goBack above

Author: fungilation

ios/RCTWebViewBridgeManager.m

@@ -81,8 +81,8 @@ + (BOOL)requiresMainQueueSetup
 
 RCT_EXPORT_METHOD(goForward:(nonnull NSNumber *)reactTag)
 {
-  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, UIView *> *viewRegistry) {
-    id view = viewRegistry[reactTag];
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTWebViewBridge *> *viewRegistry) {
+    RCTWebViewBridge *view = viewRegistry[reactTag];
     if (![view isKindOfClass:[RCTWebViewBridge class]]) {
       RCTLogError(@"Invalid view returned from registry, expecting RCTWebViewBridge, got: %@", view);
     } else {