Small fix to the defaultTemplatePath of the template.

Dear Scalatra developers,

After reading a lot of source code trying to make my Scalatra app run on Tomcat,
I noticed that the defaultTemplatePath suggested in the template was not right. As you
can see in [1], it should start with /WEB-INF.

I'm not sure whether the same is true for DefaultLayoutStrategy, but I believe so. Could you confirm that?

[1] https://github.com/scalatra/scalatra/blob/develop/scalate/src/main/scala/org/scalatra/scalate/ScalateSupport.scala#L169-L170

Best regards,
Gabriel Assis Bezerra.

P.S.: If you need any reference about me, I'm the guy who has been in touch with Ross Baker in #scalatra@freenode.net in the last few days.