refactor/rename: fix test failures in TestRewrites.
refactor/rename: fix test failures in TestRewrites.

CL https://golang.org/cl/66130 changes go/printer to format one-method
interfaces to be printed on a single line. This change broke the
equality check in TestRewrites. Fix it by reformatting the expected
file buffers so that the tests pass with tip and previous Go versions.

Change-Id: I660efd81b362554db0515760dad7c8b62e4db1b3
Reviewed-on: https://go-review.googlesource.com/75812
Reviewed-by: Alan Donovan <7069e9552f9d110b0a0f326b96f22f63fb99dfc1@google.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools