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

[sweep-ai]

• 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

• lib/functions/artifacts/artifact-armbian-zsh.sh ❌ Failed
• lib/functions/artifacts/artifact-armbian-plymouth-theme.sh ❌ Failed

[sweep-ai]

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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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