PhoneStatusBar: remove extraneous getters from mHoverButton, mHaloButton, and mSettingsButton

Using internal getters repeatedly like this can slow code down by increasing the amount of work done by the
VM.  Since we are looking at the same thing for each and the code is thread safe why not just create
a boolean once and be done with it

PS2: fix0red

Change-Id: I11a01692f63849ca331f2a0146eb34ddc48a9576