[Android/UI] The icon of the FAB should be changed when using a Jami account
I know Jami acts as a "dialer" when using a SIP account. But when using a Jami account, Jami is a messager, so the FAB should be "Plus", not "Dial".
Update: I chose "Plus" instead of "Search" not only because it's commonly used but also because there may be more function in the future, like groups :)
(English is not my first language and I'm sorry if there are some mistakes)