Correct filename for getHomeR handler in template

When generating a project with `yesod init` and then issuing `yesod devel` to
run it, the “Welcome to Yesod!” page says the getHomeR handler is in
`Handler/Root.hs`, but this should have been `Handler/Home.hs`.

yesod/scaffold/templates/homepage.hamlet.cg

@@ -6,7 +6,7 @@
     You can also use this scaffolded site to explore some basic concepts.
 
   <li> This page was generated by the #{handlerName} handler in #
-    \<em>Handler/Root.hs</em>.
+    \<em>Handler/Home.hs</em>.
 
   <li> The #{handlerName} handler is set to generate your site's home screen in Routes file #
     <em>config/routes