Avoid that InfoBarTimeshif state is shown when coming from audioselection

And possibly other instantiated infobar screens. This was intrododuced by
commit
http://sourceforge.net/p/openpli/enigma2/ci/dd50f6ce9d90eae0a513f4325a32fb7596791d35/
and solved by only doing this the first time when the InfoBar is executed.

Thanks Beeker for the early reporting
http://openpli.org/forums/topic/34480-osd-player-na-verlaten-hoofdaudiomenu/
Small changes to TimerList as suggested by DeBeek
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2 into BETA