project: Add a missing call to _CopyAndLinkFiles

If a file that is copied using a <copyfile> tag is modified and not
committed or if it is committed to a detached head, then running `repo
sync` would update the target file as expected. However, if the
modified file is committed to a local branch, then running `repo sync'
would not update the target file as expected.

Change-Id: Ic98e37d1c2e51fd1bf15abf149c7d06190cfd6d2
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/344475


Reviewed-by: Mike Frysinger <vapier@google.com>

project.py

@@ -1462,6 +1462,8 @@ class Project(object):
         cnt_mine += 1
 
     if not upstream_gain and cnt_mine == len(local_changes):
+      # The copy/linkfile config may have changed.
+      self._CopyAndLinkFiles()
       return
 
     if self.IsDirty(consider_untracked=False):