[Armbian build PR] - Syntax error fixes, dep checks & `shfmt` of board-side bash scripts

[RSS Bot]

Syntax error fixes, dep checks & shfmt of board-side bash scripts

• shfmt everything, so maybe it's easier to understand.

• armbian-hardware-optimization: fix for case without esac introduced in #4417; shfmt

• armbian-audio-config: do nothing if aplay/amixer/alsactl missing; shfmt

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