Remove unneeded API call and fix LoadVideoContentTask crash

[cewert]

Remove unneeded API call and fix app crash when AboutMe() returns invalid. Comes from roku.com crash log:

Crashlog:

i                <uninitialized> 
jsonresponse     <uninitialized> 
resp             <uninitialized> 
url              <uninitialized> 
playdefault      <uninitialized> 
preferredlanguage <uninitialized> 
m                roAssociativeArray refcnt=3 count:2 
global           Interface:ifGloba$1 streams          Invali$1 Local Variables: 
   file/line: pkg:/components/ItemGrid/LoadVideoContentTask.brs(39) 
#0  Function loaditems() As Voi$1 file/line: pkg:/components/ItemGrid/LoadVideoContentTask.brs(527) 
#1  Function findpreferredaudiostream(streams As Dynamic) As Intege$1 Backtrace: 
'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in pkg:/components/ItemGrid/LoadVideoContentTask.brs(527)

which points to this line after running build-prod on 2.1.2:

preferredLanguage = m.user.Configuration.AudioLanguagePreference

Issues

Ref #1164