Fix bogus bash binary location

aliases/available/hg.aliases.bash

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 alias hs='hg status'
 alias hsum='hg summary'
@@ -11,4 +11,4 @@ function hg-help() {
   echo "  hsum  = hg summary"
   echo "  hcm   = hg commit -m"
   echo
-}
+}