Don't --find-copies-harder when printing informational diff, either

We're doing the diff twice afaict, once to print stats to the user, and
once to actually do the upload. Definitely no need to
--find-copies-harder in the print.

Previously: https://codereview.chromium.org/2488823002.

R=dpranke@chromium.org
BUG=544889

Review-Url: https://codereview.chromium.org/2489963003
diff --git a/git_cl.py b/git_cl.py
index 5d4a6b9..3f26f21 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -725,8 +725,7 @@
     del env['GIT_EXTERNAL_DIFF']
 
   if find_copies:
-    similarity_options = ['--find-copies-harder', '-l100000',
-                          '-C%s' % similarity]
+    similarity_options = ['-l100000', '-C%s' % similarity]
   else:
     similarity_options = ['-M%s' % similarity]