[wpe] Remove unnecessary onInputMethodContextOut() call

There is a call onInputMethodContextOut() to hide IME when page loading
starts. This is a workaround because WebKit didn't properly handle IME
in this case. However, it has been fixed in WebKit by
https://bugs.webkit.org/show_bug.cgi?id=273387. Thus this call can
be removed.

Author: zhani

wpeview/src/main/java/org/wpewebkit/wpe/WKWebView.java

@@ -460,7 +460,6 @@ private void onLoadChanged(int loadEvent) {
         case WKWebView.LOAD_STARTED:
             if (wpeViewClient != null)
                 wpeViewClient.onPageStarted(wpeView, uri);
-            onInputMethodContextOut();
             break;
         case WKWebView.LOAD_FINISHED:
             if (wpeViewClient != null)