Fix label color input.

app/models/label.rb

@@ -13,6 +13,8 @@
 class Label < ActiveRecord::Base
   DEFAULT_COLOR = '#428BCA'
 
+  default_value_for :color, DEFAULT_COLOR
+
   belongs_to :project
   has_many :label_links, dependent: :destroy
   has_many :issues, through: :label_links, source: :target, source_type: 'Issue'

app/views/projects/labels/_form.html.haml

@@ -16,7 +16,7 @@
     .col-sm-10
       .input-group
         .input-group-addon.label-color-preview  
-        = f.color_field :color, value: "#AA33EE", class: "form-control"
+        = f.color_field :color, class: "form-control"
       .help-block
         Choose any color.
         %br