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

Base/home/anon/.shellrc

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/Shell
 
 # IFS controls what $(...) (inline evaluate) would split its captured
 # string with. the default is \x0a (i.e. newline).

Base/home/anon/Tests/run-tests-and-shutdown.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/Shell
 
 echo
 echo "==== Running Tests on SerenityOS ===="