[PR #8516/70c8042c backport][stable-9] proxmox_template: small refactor in get_template()

[patchback[bot]]

This is a backport of PR #8516 as merged into main (70c8042c997b33c2170d2c65020f27e1768386b6).

SUMMARY

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

ISSUE TYPE

• Refactoring Pull Request

COMPONENT NAME

proxmox_template

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