remove redundant method

Author: h7io

code/DropdownImageField.php

@@ -79,15 +79,6 @@ public function Field($properties = array()) {
         return FormField::Field($properties);
     }
 
-    /**
-     * Gets the source
-     * 
-     * @return Object
-     */
-    public function getSource() {
-        return $this->source;
-    }
-
     /**
      * Get the source of this field as an array
      * Transform the source DataList to an key => value array