Don't use extglob in bash/docker-machine.bash
Don't use extglob in bash/docker-machine.bash

extglob is not needed here - the only call is:
_docker_machine_map_key_of_current_option '--filter'

So $glob is always '--filter', so there isn't every a pattern-list to match.

According to my testing completion for docker-machine
ls --filter completion works for both driver and state

Fixes #4126
Introduced in fd9a0a683c69d94813eabecf8b5062ab38237e6c

Signed-off-by: Ben Woosley <3df0af5b774b3387e3ad4650a6c28cf09923a05a@gmail.com>

docker/machine,londoncalling/machine,exoscale/docker-machine,SvenDowideit/machine,dgageot/machine,exoscale/docker-machine,voutilad/machine,Herbis/machine,SvenDowideit/machine,Herbis/machine,voutilad/machine,docker/machine,ibuildthecloud/machine,dweomer/docker-machine,dgageot/machine,londoncalling/machine,ibuildthecloud/machine,dweomer/docker-machine