Fixing shebang statements for edge cases (#1105)

* selecting /usr/bin/env helps edgecases

There are systems (though rare) that don't have bash, but instead only have sh, or zsh, etc, which would otherwise be able to use our shell scripts, there's no reason to not allow the environment to select its shell.

* Update DYNAMIC_INSTALL.sh

This applies to both the dynamic and appimage installations

Author: OrioleNix

scripts/APPIMAGE_INSTALL.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env
 
 # exit on error
 set -e

scripts/DYNAMIC_INSTALL.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env
 
 # exit on error
 set -e