Fix enclosure extensions.  For some video sites, it was returning as 'flv?key=value&key=value', when it should have just been 'flv'.
Fix enclosure extensions.  For some video sites, it was returning as 'flv?key=value&key=value', when it should have just been 'flv'.

wikidi/simplepie,blat/simplepie,barryvdh/simplepie,songfj/simplepie,skyzyx/simplepie,songfj/simplepie,Alexia/SimplePie,gsnedders/complexpie,barryvdh/simplepie,FreshRSS/simplepie,Alkarex/simplepie,skyzyx/simplepie,songfj/simplepie,Alkarex/simplepie,mblaney/simplepie,ropik/simplepie,blat/simplepie,wikidi/simplepie,Alkarex/simplepie,wikidi/simplepie,simplepie/simplepie,mblaney/simplepie,blat/simplepie,simplepie/simplepie,FreshRSS/simplepie,barryvdh/simplepie,ropik/simplepie,Alexia/SimplePie