XE-1404: Switch to Flamingo Skin by default.
- Fixed tests
XWIKI-10771: The text from "Mon Flux d'Activit" doesn't fit with its backgound when is selected
XWIKI-10738: Be able to control the display of the Add button (new page) with a skin variable (in layoutExtraVars.vm).
XWIKI-10762: Be able to control the display of the "More actions" menu with a skin variable (in layoutExtraVars.vm).
XE-1404: Switch to Flamingo Skin by default.

* Fix a regression introduced by a previous fix.
[misc] Fixed tests and page objects.