Update broadcast_message helper

Now it returns the fully-formatted message so we can be consistent about
how it's shown.

app/helpers/application_helper.rb

@@ -181,10 +181,6 @@ module ApplicationHelper
     end
   end
 
-  def broadcast_message
-    BroadcastMessage.current
-  end
-
   # Render a `time` element with Javascript-based relative date and tooltip
   #
   # time       - Time object

app/helpers/broadcast_messages_helper.rb

@@ -1,16 +1,24 @@
 module BroadcastMessagesHelper
-  def broadcast_styling(broadcast_message)
-    styling = ''
+  def broadcast_message(message = BroadcastMessage.current)
+    return unless message.present?
+
+    content_tag :div, class: 'broadcast-message', style: broadcast_message_style(message) do
+      icon('bullhorn') << ' ' << message.message
+    end
+  end
+
+  def broadcast_message_style(broadcast_message)
+    style = ''
 
     if broadcast_message.color.present?
-      styling << "background-color: #{broadcast_message.color}"
-      styling << '; ' if broadcast_message.font.present?
+      style << "background-color: #{broadcast_message.color}"
+      style << '; ' if broadcast_message.font.present?
     end
 
     if broadcast_message.font.present?
-      styling << "color: #{broadcast_message.font}"
+      style << "color: #{broadcast_message.font}"
     end
 
-    styling
+    style
   end
 end

app/views/layouts/_broadcast.html.haml

@@ -1,4 +1 @@
-- if broadcast_message.present?
-  .broadcast-message{ style: broadcast_styling(broadcast_message) }
-    = icon('bullhorn')
-    = broadcast_message.message
+= broadcast_message