made webview also work on legacy phones

needed some changes in webos.js, too.

WebView on phones is not perfect, but works good enough
for oauth and similar small stuff. Remaining issues:
- scrolling does not work. Workaround: Make webview "big" and embed in scroller
- copy & paste does not work.
- special chars properly do not work

Webview on TouchPad is not affected by the changes and works as expected.