override alerts should cause a rewind attempt as well

When git says 'Your local changes to the following files would be
overwritten by checkout' we should probably try a rewind as well.
diff --git a/src/plugins/scanners/git-sync.py b/src/plugins/scanners/git-sync.py
index fcfe136..c497e52 100644
--- a/src/plugins/scanners/git-sync.py
+++ b/src/plugins/scanners/git-sync.py
@@ -101,7 +101,7 @@
                 except subprocess.CalledProcessError as err:
                     e = str(err.output).lower()
                     # We're interested in merge conflicts, which we can resolve through trickery.
-                    if n > 0 or not ('resolve' in e or 'merge' in e):
+                    if n > 0 or not ('resolve' in e or 'merge' in e or 'overwritten' in e):
                         # This isn't a merge conflict, pass it to outer func
                         raise err
                     else: