XWIKI-1342: Colibri theme - Mapping .actionmenu

- Removed duplicated after https://github.com/evalica/bootswatch/commit/3d7767b7d8f90b59c622a1180143c4b2e769ab4f and https://github.com/evalica/bootswatch/commit/d7c5a957fc26959c7c11a191c1862b2fe6129492