[archiso] Misc style cleanups
* Add #!/bin/bash to install hooks and fixed vimlines.
* Removed empty variables.
* Reorder variables, adjust brace/parens in functions.
* Removed things implemented in base hook (/tmp, /etc/fstab).
Signed-off-by:
Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>
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