Option to show status bar in expanded desktop mode (1/2)

This commit changes the "Expanded desktop" checkbox in the "Power menu" settings to a list containing the options "Off", "With status bar", and
"Without status bar".

Patch-set 1: fix erroneous whitespace/tabs.
Patch-set 2: missed some whitespace.
Patch-set 3: fix typos, clarify variable names.

Change-Id: I491538d1e537b5b245ff8621e88bc2012ca17a49
Signed-off-by: Michael A. Alcorn <airalcorn2@gmail.com>