Removed duplicate test file
Removed duplicate test file

- This happened by accident when the model filters were introduced
- filters_spec.js was supposed to be renamed to apps_filters_spec.js
- Removing the duplicate file now

Kikobeats/Ghost,kevinansfield/Ghost,ErisDS/Ghost,e10/Ghost,acburdine/Ghost,TryGhost/Ghost,kevinansfield/Ghost,acburdine/Ghost,ErisDS/Ghost,JohnONolan/Ghost,e10/Ghost,TryGhost/Ghost,dbalders/Ghost,Kikobeats/Ghost,kevinansfield/Ghost,Gargol/Ghost,JohnONolan/Ghost,TryGhost/Ghost,acburdine/Ghost,Kikobeats/Ghost,Gargol/Ghost,janvt/Ghost,chevex/undoctrinate,dbalders/Ghost,janvt/Ghost,ErisDS/Ghost,dbalders/Ghost,bitjson/Ghost,bitjson/Ghost,JohnONolan/Ghost