Fix unresponsive main window after hide

src/ios/CDVWKInAppBrowser.m

@@ -340,6 +340,10 @@ static CDVWKInAppBrowser* instance = nil;
 
 - (void)hide:(CDVInvokedUrlCommand*)command
 {
+    // Set tmpWindow to hidden to make main webview responsive to touch again
+    // https://stackoverflow.com/questions/4544489/how-to-remove-a-uiwindow
+    self->tmpWindow.hidden = YES;
+
     if (self.inAppBrowserViewController == nil) {
         NSLog(@"Tried to hide IAB after it was closed.");
         return;