Update highlightjs init
ephy-resource:///org/gnome/epiphany/highlightjs/highlight.js:1491:18: CONSOLE LOG Deprecated as of 10.6.0. initHighlightingOnLoad() is deprecated. Use highlightAll() instead.
ephy-resource:///org/gnome/epiphany/highlightjs/highlight.js:1491:18: CONSOLE LOG Deprecated as of 10.6.0. initHighlightingOnLoad() is deprecated. Use highlightAll() instead.