Update CDVThemeableBrowser.m

initialxy/cordova-plugin-themeablebrowser#83

Author: knyazz

src/ios/CDVThemeableBrowser.m

@@ -1152,6 +1152,12 @@ - (void)showToolBar:(BOOL)show : (NSString *) toolbarPosition
     }
 }
 
+- (void) dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion {
+    if ( self.presentedViewController) {
+        [super dismissViewControllerAnimated:flag completion:completion];
+    }
+}
+
 - (void)viewDidLoad
 {
     [super viewDidLoad];