Show message 'anoneditwarning' in notices when applicable

Currently this code is unreachable as line 27 of the hooks file
checks the user's options for 'visualeditor-enable' before allowing
VE to load. For testing just comment out that line.

Bug: 47842
Change-Id: Ib5c3284c646ebcc0a8cad0b02de559d7820e05a0
Merge "Show message 'anoneditwarning' in notices when applicable"