Fix a bug where the recursive patch mission sends you to the wrong place
Fix a bug where the recursive patch mission sends you to the wrong place

To reproduce:

* Visit http://openhatch.org/missions/diffpatch/recursive_patch
  and submit the correct answer (3)

* Notice that you get redirected to somewhere *other* than
  http://openhatch.org/missions/diffpatch/recursive_patch

(Replace openhatch.org with 127.0.0.1:8000 for local dev
instances, obviously.)

Thanks to Shawn for review.

Closes: http://openhatch.org/bugs/issue737

openhatch/oh-mainline,mzdaniel/oh-mainline,nirmeshk/oh-mainline,Changaco/oh-mainline,ehashman/oh-mainline,moijes12/oh-mainline,willingc/oh-mainline,sudheesh001/oh-mainline,vipul-sharma20/oh-mainline,Changaco/oh-mainline,SnappleCap/oh-mainline,campbe13/openhatch,openhatch/oh-mainline,onceuponatimeforever/oh-mainline,heeraj123/oh-mainline,SnappleCap/oh-mainline,ehashman/oh-mainline,willingc/oh-mainline,ojengwa/oh-mainline,willingc/oh-mainline,moijes12/oh-mainline,heeraj123/oh-mainline,waseem18/oh-mainline,vipul-sharma20/oh-mainline,heeraj123/oh-mainline,Changaco/oh-mainline,ehashman/oh-mainline,sudheesh001/oh-mainline,moijes12/oh-mainline,sudheesh001/oh-mainline,mzdaniel/oh-mainline,Changaco/oh-mainline,moijes12/oh-mainline,onceuponatimeforever/oh-mainline,mzdaniel/oh-mainline,willingc/oh-mainline,eeshangarg/oh-mainline,nirmeshk/oh-mainline,waseem18/oh-mainline,mzdaniel/oh-mainline,ojengwa/oh-mainline,eeshangarg/oh-mainline,eeshangarg/oh-mainline,nirmeshk/oh-mainline,waseem18/oh-mainline,openhatch/oh-mainline,ehashman/oh-mainline,mzdaniel/oh-mainline,heeraj123/oh-mainline,onceuponatimeforever/oh-mainline,ojengwa/oh-mainline,campbe13/openhatch,Changaco/oh-mainline,nirmeshk/oh-mainline,campbe13/openhatch,eeshangarg/oh-mainline,campbe13/openhatch,openhatch/oh-mainline,vipul-sharma20/oh-mainline,willingc/oh-mainline,vipul-sharma20/oh-mainline,SnappleCap/oh-mainline,heeraj123/oh-mainline,sudheesh001/oh-mainline,waseem18/oh-mainline,mzdaniel/oh-mainline,ojengwa/oh-mainline,campbe13/openhatch,sudheesh001/oh-mainline,onceuponatimeforever/oh-mainline,onceuponatimeforever/oh-mainline,ojengwa/oh-mainline,SnappleCap/oh-mainline,vipul-sharma20/oh-mainline,openhatch/oh-mainline,moijes12/oh-mainline,nirmeshk/oh-mainline,mzdaniel/oh-mainline,waseem18/oh-mainline,eeshangarg/oh-mainline,SnappleCap/oh-mainline,ehashman/oh-mainline