Added temp file cleanup for invalid themes
Added temp file cleanup for invalid themes

refs #10174

- When theme check fails with validation error there was no cleanup of files left from zip extraction

bitjson/Ghost,kevinansfield/Ghost,Kikobeats/Ghost,TryGhost/Ghost,Kikobeats/Ghost,e10/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,ErisDS/Ghost,TryGhost/Ghost,e10/Ghost,ErisDS/Ghost,JohnONolan/Ghost,JohnONolan/Ghost,TryGhost/Ghost,kevinansfield/Ghost,janvt/Ghost,ErisDS/Ghost,bitjson/Ghost,janvt/Ghost,kevinansfield/Ghost