Unarchive stop passing file mode to tar command (#4179)

Fixes #4063.

Tar does not use this parameter on extraction (-x) or diff (-d)(the
only two cases where it is passed in unarchive). It only uses it on
creation:
https://www.gnu.org/software/tar/manual/html_section/tar_33.html

Providing `unarchive` with a file mode of `0755` (octal) makes it pass
the argument `--mode 493` (493 = 0755 in decimal) to `tar`, which then
fails while verifying it (because it contains an invalid octal char
'9'). Not passing the parameter to tar solves the issue.

lib/ansible/modules/files/unarchive.py

@@ -621,8 +621,6 @@ class TgzArchive(object):
             cmd.append('--owner=' + quote(self.file_args['owner']))
         if self.file_args['group']:
             cmd.append('--group=' + quote(self.file_args['group']))
-        if self.file_args['mode']:
-            cmd.append('--mode=' + quote(self.file_args['mode']))
         if self.module.params['keep_newer']:
             cmd.append('--keep-newer-files')
         if self.excludes:
@@ -670,8 +668,6 @@ class TgzArchive(object):
             cmd.append('--owner=' + quote(self.file_args['owner']))
         if self.file_args['group']:
             cmd.append('--group=' + quote(self.file_args['group']))
-        if self.file_args['mode']:
-            cmd.append('--mode=' + quote(self.file_args['mode']))
         if self.module.params['keep_newer']:
             cmd.append('--keep-newer-files')
         if self.excludes: