limactl create: do not show "hidden" templates

[alexandear]

Before:

❯ limactl --version
limactl version 1.1.1
❯ limactl create --name=issue3622
? Creating an instance "issue3622" Choose another template (docker, podman, archlinux, fedora, ...)
? Choose a template  [Use arrows to move, type to filter]
> _default/mounts
  _images/almalinux-8
  _images/almalinux-9
  _images/almalinux-kitten-10
  _images/alpine
  _images/alpine-iso
  _images/archlinux

After:

❯ _output/bin/limactl --version
limactl version 1.1.1-55-g5a0b5aa7
❯ _output/bin/limactl create --name=issue3622
? Creating an instance "issue3622" Choose another template (docker, podman, archlinux, fedora, ...)
? Choose a template  [Use arrows to move, type to filter]
> almalinux
  almalinux-10
  almalinux-8
  almalinux-9
  almalinux-kitten
  almalinux-kitten-10
  alpine

Fixes #3627

[AkihiroSuda]

Thanks