Removed the headers form copy build phase - they are copied as headers. This was causing build error on Xcode 10 (#3774)

lib/ios/ReactNativeNavigation.xcodeproj/project.pbxproj

@@ -123,8 +123,6 @@
 		50BE951320B5A787004F5DF5 /* RNNStatusBarOptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 50BE951120B5A787004F5DF5 /* RNNStatusBarOptions.h */; };
 		50C4A496206BDDBB00DB292E /* RNNSubtitleOptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 50C4A494206BDDBB00DB292E /* RNNSubtitleOptions.h */; };
 		50C4A497206BDDBB00DB292E /* RNNSubtitleOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = 50C4A495206BDDBB00DB292E /* RNNSubtitleOptions.m */; };
-		50C5FD8220D7D6D600F1EA8A /* ReactNativeNavigation.h in CopyFiles */ = {isa = PBXBuildFile; fileRef = 7BA500731E2544B9001B9E1B /* ReactNativeNavigation.h */; };
-		50C5FD8320D7D6DD00F1EA8A /* RNNBridgeManagerDelegate.h in CopyFiles */ = {isa = PBXBuildFile; fileRef = 502CB43920CBCA140019B2FE /* RNNBridgeManagerDelegate.h */; };
 		50CB3B691FDE911400AA153B /* RNNSideMenuOptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 50CB3B671FDE911400AA153B /* RNNSideMenuOptions.h */; };
 		50CB3B6A1FDE911400AA153B /* RNNSideMenuOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = 50CB3B681FDE911400AA153B /* RNNSideMenuOptions.m */; };
 		50D031342005149000386B3D /* RNNOverlayManager.h in Headers */ = {isa = PBXBuildFile; fileRef = 50D031322005149000386B3D /* RNNOverlayManager.h */; };
@@ -222,8 +220,6 @@
 			dstPath = "include/$(PRODUCT_NAME)";
 			dstSubfolderSpec = 16;
 			files = (
-				50C5FD8320D7D6DD00F1EA8A /* RNNBridgeManagerDelegate.h in CopyFiles */,
-				50C5FD8220D7D6D600F1EA8A /* ReactNativeNavigation.h in CopyFiles */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};