proxmox_template: small refactor in get_template()

[russoz]

SUMMARY

Small improvement on the logic for determining whether a template exists.

ISSUE TYPE

• Refactoring Pull Request

COMPONENT NAME

proxmox_template

[ansibullbot]

cc @Ajpantuso @Thulium-Drake @UnderGreen @joshainglis @karmab @krauthosting click here for bot help

[patchback[bot]]

Backport to stable-9: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-9/70c8042c997b33c2170d2c65020f27e1768386b6/pr-8516

Backported as https://github.com/ansible-collections/community.general/pull/8561

🤖 @patchback I'm built with octomachinery and my source is open — https://github.com/sanitizers/patchback-github-app.

[felixfontein]

@russoz thanks!