DEV: Fix watching plugin stylesheet changes locally

DEV: Fix watching plugin stylesheet changes locally

I broke this in e6dbb4fcf52fa74853ed45616dd7cbf620c7deca

diff --git a/lib/stylesheet/watcher.rb b/lib/stylesheet/watcher.rb
index f54fe1d..908e5b3 100644
--- a/lib/stylesheet/watcher.rb
+++ b/lib/stylesheet/watcher.rb
@@ -111,12 +111,12 @@ module Stylesheet
       targets = [plugin_name]
       targets.push("#{plugin_name}_mobile") if DiscoursePluginRegistry.stylesheets_exists?(plugin_name, :mobile)
       targets.push("#{plugin_name}_desktop") if DiscoursePluginRegistry.stylesheets_exists?(plugin_name, :desktop)
-
       message = targets.map! do |name|
         msgs = []
         active_themes.each do |theme_id|
           msgs << Stylesheet::Manager.stylesheet_data(name.to_sym, theme_id)
         end
+        msgs
       end.flatten!
       MessageBus.publish '/file-change', message
     end

GitHub sha: d0953dcd