repopick: Print change subject as unicode

* This prevents from seeing stuff like
  "b'frameworks: Add unlinked ringtone and notification volumes'"
  when using python3 as default.

Change-Id: Ie1fa85681b648edcee65680d784da4dff1779616

build/tools/repopick.py

@@ -404,7 +404,7 @@ if __name__ == '__main__':
 
         # Print out some useful info
         if not args.quiet:
-            print('--> Subject:       "{0}"'.format(item['subject'].encode('utf-8')))
+            print(u'--> Subject:       "{0}"'.format(item['subject']))
             print('--> Project path:  {0}'.format(project_path))
             print('--> Change number: {0} (Patch Set {1})'.format(item['id'], item['patchset']))