Revert "Set homepage in created scripts to frontmost Safari URL"

This reverts commit a1ed2cb19706e317d34f1a9f2efe8a2d2388afae.

The is running part of the Applescript didn't seem to prevent Safari getting
loaded when it wasn't running when used via osascript. It worked in
ScriptEditor! Honest!

Also we decided that it probably wouldn't work often enough anyway.

Discussion: a1ed2cb197

Library/Homebrew/brew.h.rb

@@ -29,15 +29,13 @@ def __make url, name
   path = Formula.path name
   raise "#{path} already exists" if path.exist?
 
-  homepage = `osascript -e 'tell application "Safari" to if running then get URL of document of first window'`.chomp
-
   template=<<-EOS
             require 'brewkit'
 
             class #{Formula.class_s name} <Formula
               url '#{url}'
+              homepage ''
               md5 ''
-              homepage '#{homepage}'
 
   cmake       depends_on 'cmake'