libmediaplayerservice: update NuPlayer scoreFactory for http://

Update score being returned from NuPlayerFactory for
http:// streaming use cases. Do not return highest
score if http:// found. This results in NuPlayer used
for all http://

There can special use cases as dash http:// streaming
with .mpd extension for which dashplayer needs to be used.

Change-Id: I67a713b4f8c5126bc6dd26871c5c491ac32649cf