Everywhere: Use /bin/Shell as the shebang for Shell scripts

Author: https://github.com/alimpfard
Commit: eb20fbe145
Pull-request: https://github.com/SerenityOS/serenity/pull/17437
Reviewed-by: https://github.com/kleinesfilmroellchen
Reviewed-by: https://github.com/linusg

Userland/Shell/Tests/control-structure-as-command.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/Shell
 
 source $(dirname "$0")/test-commons.inc