Dont enable Wi-Fi if it's not toggleable in flight mode

Dont enable Wi-Fi if it's not toggleable in flight mode
by restoring the return which was removed by
e78c1879058571c00879f0d3e756951302adf513

Change-Id: I8ca5a3e9b3f36f148f08ce97b8a2b854bf7de21c
No back icon in action bar of APN Settings

When entering the APN menu, the actionbar is missing a back
icon allowing the user to go back to the previous pane.

Added parentActivityName in ApnSettings, to enable action
bar back icon.

Change-Id: Iee8bb420f47c0e2c0d9a43739f534466abba30db