filenamify: Make title regexp stricter
filenamify: Make title regexp stricter

The - character is a range operator when used in character classes
(e.g. [0-9]). In our case, we want it to match a literal - (which it
coindicentally does, since it's within the range [ -.]. But we don't
want it to match other characters within this range.

qnorsten/svtplay-dl,selepo/svtplay-dl,selepo/svtplay-dl,spaam/svtplay-dl,spaam/svtplay-dl,iwconfig/svtplay-dl,iwconfig/svtplay-dl,dalgr/svtplay-dl,olof/svtplay-dl,qnorsten/svtplay-dl,dalgr/svtplay-dl,olof/svtplay-dl