module removal fix
module removal fix

Summary:
Removing a file didn't always clear out the eponymous module. Not sure whether
this caused issues in the past, but seems cleaner to do so.

Discovered when printing out what happens with tests/incremental_delete.

Reviewed By: mroch

Differential Revision: D4598964

fbshipit-source-id: b4ea5b9bd8893b08096a1b142b186fc8fcb08b12

AgentME/flow,fletcherw/flow,gabro/flow,gabro/flow,fletcherw/flow,samwgoldman/flow,gabelevi/flow,samwgoldman/flow,gabro/flow,claudiopro/flow,jamesgpearce/flow,TiddoLangerak/flow,nmote/flow,claudiopro/flow,gabelevi/flow,jamesgpearce/flow,JonathanUsername/flow,popham/flow,nmote/flow,ylu1317/flow,samwgoldman/flow,gabro/flow,facebook/flow,popham/flow,MichaelDeBoey/flow,ylu1317/flow,mroch/flow,JonathanUsername/flow,gabro/flow,nmote/flow,gabelevi/flow,jamesgpearce/flow,mroch/flow,JonathanUsername/flow,JonathanUsername/flow,TiddoLangerak/flow,jamesgpearce/flow,MichaelDeBoey/flow,mroch/flow,ylu1317/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,JonathanUsername/flow,ylu1317/flow,nmote/flow,ylu1317/flow,TiddoLangerak/flow,facebook/flow,jamesgpearce/flow,TiddoLangerak/flow,samwgoldman/flow,popham/flow,fletcherw/flow,gabelevi/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,gabelevi/flow,samwgoldman/flow,nmote/flow,claudiopro/flow,fletcherw/flow,facebook/flow,AgentME/flow,AgentME/flow,AgentME/flow,jamesgpearce/flow,gabro/flow,fletcherw/flow,samwgoldman/flow,TiddoLangerak/flow,gabelevi/flow,popham/flow,popham/flow,JonathanUsername/flow,MichaelDeBoey/flow,claudiopro/flow,mroch/flow,gabelevi/flow,popham/flow,popham/flow,JonathanUsername/flow,AgentME/flow,facebook/flow,fletcherw/flow,mroch/flow,facebook/flow,claudiopro/flow,nmote/flow