scripts/tags.sh: Fix obsolete parameter for ctags

Distros such as Fedora and Arch are using the maintained
universal-ctags implementation. This version has replaced
the obsolete --extra flag with --extras.

Signed-off-by: Philip K. Gisslow <ripxorip@gmail.com>
Link: https://lore.kernel.org/r/20210905073133.21910-1-ripxorip@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>