added default for frequently used emojis

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.4.0 (unreleased)
-  - Add "Frequently used" category to emoji picker
-
-v 8.3.0 (unreleased)
   - Fix Error 500 when doing a search in dashboard before visiting any project (Stan Hu)
   - Implement new UI for group page
   - Implement search inside emoji picker
   - Add project permissions to all project API endpoints (Stan Hu)
+  - Add "Frequently used" category to emoji picker
+
 
 v 8.3.0
   - Add CAS support (tduehr)

app/assets/javascripts/awards_handler.coffee

@@ -127,10 +127,12 @@ class @AwardsHandler
 
   getFrequentlyUsedEmojis: ->
     frequently_used_emojis = ($.cookie('frequently_used_emojis') || "").split(",")
+
+    frequently_used_emojis = ["thumbsup", "thumbsdown"].concat(frequently_used_emojis)
+
     _.compact(_.uniq(frequently_used_emojis))
 
   renderFrequentlyUsedBlock: ->
-    if $.cookie('frequently_used_emojis')
     frequently_used_emojis = @getFrequentlyUsedEmojis()
 
     ul = $("<ul>")