Replace content_security_policy_nonce with content_security_policy_script_nonce.

To avoid an conflict with Rails, and to avoid confusing by twitter's gem overloading the method.

app/views/conversations/new.mobile.haml

@@ -2,7 +2,7 @@
 -#   licensed under the Affero General Public License version 3 or later.  See
 -#   the COPYRIGHT file.
 
-%script{nonce: content_security_policy_nonce(:script)}
+%script{nonce: content_security_policy_script_nonce}
   :plain
     $(document).ready(function () {
       var data = $.parseJSON( "#{escape_javascript(@contacts_json).html_safe}" ),

app/views/layouts/_head.haml

@@ -21,7 +21,7 @@
   = stylesheet_link_tag :poltergeist_disable_transition, media: "all"
 
 = jquery_include_tag
-= include_gon(camel_case: true, nonce: content_security_policy_nonce(:script))
+= include_gon(camel_case: true, nonce: content_security_policy_script_nonce)
 = yield(:javascript)
 
 = csrf_meta_tag