[codemod] log input files for UntypedFlowInitRunner
[codemod] log input files for UntypedFlowInitRunner

Summary: This was added to the other runner types but not the `UntypedFlowInitRunner`. This diff fixes that.

Reviewed By: panagosg7

Differential Revision: D21408792

fbshipit-source-id: 4817279d0921f440b20667fb7219dcfcd856eddb

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow