change sh to bash in shebang to make scripts work

util/add_addon_repo

@@ -1,4 +1,4 @@
-#!/bin/sh -f
+#!/bin/bash -f
 
 if [ $# -ne 2 ]; then
 	echo usage: $0 repo_url nickname

util/add_theme_repo

@@ -1,4 +1,4 @@
-#!/bin/sh -f
+#!/bin/bash -f
 
 
 if [ $# -ne 2 ]; then

util/add_widget_repo

@@ -1,4 +1,4 @@
-#!/bin/sh -f
+#!/bin/bash -f
 
 if [ $# -ne 2 ]; then
 	echo usage: $0 repo_url nickname