Fix polarity for ThisTypeAppT in type visitor
Fix polarity for ThisTypeAppT in type visitor

Summary:
Like TypeAppT, the class type is in a constant positive position. That is, even
if the ThisTypeAppT appears on the right, the class type will always appear on
the left.

Reviewed By: jbrown215

Differential Revision: D10226527

fbshipit-source-id: dd4180d0513769dbb253fc65e7b0e2e0d153f9a9

gabelevi/flow,jamesgpearce/flow,popham/flow,jamesgpearce/flow,samwgoldman/flow,samwgoldman/flow,AgentME/flow,facebook/flow,popham/flow,AgentME/flow,gabelevi/flow,samwgoldman/flow,jamesgpearce/flow,popham/flow,jamesgpearce/flow,popham/flow,samwgoldman/flow,mroch/flow,mroch/flow,gabelevi/flow,facebook/flow,gabelevi/flow,mroch/flow,samwgoldman/flow,jamesgpearce/flow,gabelevi/flow,mroch/flow,facebook/flow,samwgoldman/flow,mroch/flow,facebook/flow,gabelevi/flow,popham/flow,jamesgpearce/flow,AgentME/flow,popham/flow,facebook/flow,samwgoldman/flow,mroch/flow,AgentME/flow,mroch/flow,jamesgpearce/flow,facebook/flow,AgentME/flow,facebook/flow,popham/flow,gabelevi/flow