cef: Use webview.zoom_level to store zoom level config
cef: Use webview.zoom_level to store zoom level config

ValaCEF has switched to percentage zoom, so it should be compatible
with WebKitGTK.

Signed-off-by: Jiří Janoušek <2a48236b6dcae98c8c0e90f4673742773ee17d91@gmail.com>

tiliado/nuvolaruntime,tiliado/nuvolaruntime,tiliado/nuvolaruntime,tiliado/nuvolaruntime