Revert "fix keyback bug after opened a page (cocos2d#18153)" (cocos2d#18601)

This reverts commit 6d50a84.

Author: minggo

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxWebView.java

@@ -50,7 +50,7 @@ public Cocos2dxWebView(Context context, int viewTag) {
         this.mJSScheme = "";
 
         this.setFocusable(true);
-        this.setFocusableInTouchMode(false);
+        this.setFocusableInTouchMode(true);
 
         this.getSettings().setSupportZoom(false);