motion_controller_spec: Fixed failing spec.
motion_controller_spec: Fixed failing spec.

* Passed in a motion id instead of a group id (run `rake routes` to see
which params you should be passing to a given controller action).
* Stubbed out `motion.close_voting!` so that the spec would run without
actually making any calls to the model.

FSFTN/Loomio,juliagra/loomio,gvalerin/loomio,HadoDokis/loomio,wangjun/loomio,sicambria/loomio,codingnutty/loomio,wangjun/loomio,sicambria/loomio,digideskio/loomio,piratas-ar/loomio,aca13jmf/loomio,Collabforge/site-collabio,HadoDokis/loomio,loomio/loomio,gvalerin/loomio,juliagra/loomio,mhjb/loomio,digideskio/loomio,kimihito/loomio,annewchen/loomio,juliagra/loomio,isomerase/loomio,gvalerin/loomio,doomergithub/loomio,tachyons/loomio,tachyons/loomio,mhjb/loomio,loomio/loomio,loomio/loomio,FSFTN/Loomio,HadoDokis/loomio,tachyons/loomio,doomergithub/loomio,mlarghydracept/loomio,aca13jmf/loomio,isomerase/loomio,labhackercd/loomio,juliagra/DBCloomio,annewchen/loomio,annewchen/loomio,mlarghydracept/loomio,codingnutty/loomio,kimihito/loomio,Collabforge/site-collabio,Collabforge/site-collabio,HadoDokis/loomio,piratas-ar/loomio,piratas-ar/loomio,mhjb/loomio,piratas-ar/loomio,wangjun/loomio,mlarghydracept/loomio,isomerase/loomio,Collabforge/site-collabio,kimihito/loomio,sicambria/loomio,mhjb/loomio,labhackercd/loomio,juliagra/DBCloomio,codingnutty/loomio,labhackercd/loomio,isomerase/loomio,tachyons/loomio,loomio/loomio,aca13jmf/loomio,FSFTN/Loomio,juliagra/DBCloomio,doomergithub/loomio,digideskio/loomio,sicambria/loomio,labhackercd/loomio,FSFTN/Loomio