Cleanup coding style via "make cleanup-style"

tools/create-screenshot-for-doc

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eu
 
 if [ "$#" -ne 2 ]; then

tools/patch-tool-mxe

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Tool for converting between MXE patch files and git repos
 # Imports and exports patch files in "git format-patch" format.