alias/msys2: `shellcheck`

aliases/available/msys2.aliases.bash

@@ -1,6 +1,4 @@
-#!/bin/bash
-
-cite 'about-alias'
+# shellcheck shell=bash
 about-alias 'MSYS2 aliases'
 
 LS_COMMON="-hG"
@@ -9,7 +7,7 @@ LS_COMMON="$LS_COMMON -I NTUSER.DAT\* -I ntuser.dat\*"
 
 # alias
 # setup the main ls alias if we've established common args
-test -n "$LS_COMMON" && alias ls="command ls $LS_COMMON"
+alias ls='command ls ${LS_COMMON:-}'
 alias ll="ls -l"
 alias la="ls -a"
 alias lal="ll -a"