Simplify translate gtt_tile_source to layer

Author: sanak

lib/redmine_gtt/patches/projects_helper_patch.rb

@@ -18,16 +18,7 @@ def render_api_includes(project, api)
         super
         api.array :layers do
           project.gtt_tile_sources.each do |gtt_tile_source|
-            api.layer(
-              :id => gtt_tile_source.id,
-              :name => gtt_tile_source.name,
-              :type => gtt_tile_source.type,
-              :options => gtt_tile_source.options,
-              :global => gtt_tile_source.global,
-              :default => gtt_tile_source.default,
-              :position => gtt_tile_source.position,
-              :baselayer => gtt_tile_source.baselayer
-            )
+            api.layer(gtt_tile_source)
           end
         end if include_in_api_response?('layers')
       end