Do not launch floating window when on default launcher

We only do this when user is on the default launcher
because if the user was on a non-default launcher,
he/she must have been there for some purpose and we
do not want to throw him/her back to the default
launcher incase he/she exits the app with HOME button.

Change-Id: I01d1128a25b08c979d693bb99e7c4907ee209d58