Sweep: Replace 'x-hack' conditionals in artifact-armbian-zsh.sh and artifact-armbian-plymouth-theme.sh

[sweep-ai[bot]]

• In lib/functions/artifacts/artifact-armbian-zsh.sh, replace all 'x-hack' conditionals with modern conditionals.
• In lib/functions/artifacts/artifact-armbian-plymouth-theme.sh, replace all 'x-hack' conditionals with modern conditionals.

Parent issue: #2

Checklist

- [X] `lib/functions/artifacts/artifact-armbian-zsh.sh` ❌ Failed - [X] `lib/functions/artifacts/artifact-armbian-plymouth-theme.sh` ❌ Failed

[sweep-ai[bot]]

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File Path	Proposed Changes
lib/functions/artifacts/artifact-armbian-zsh.sh	Modify lib/functions/artifacts/artifact-armbian-zsh.sh with contents: • Replace all instances of 'x-hack' conditionals with modern equivalents. For example, change '[ "x${variable}" = "xvalue" ]' to '[ "${variable}" = "value" ]'.
lib/functions/artifacts/artifact-armbian-plymouth-theme.sh	Modify lib/functions/artifacts/artifact-armbian-plymouth-theme.sh with contents: • Replace all instances of 'x-hack' conditionals with modern equivalents. For example, change '[ "x${variable}" = "xvalue" ]' to '[ "${variable}" = "value" ]'.

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