add editor icon for Selectable

bin/Data/UI/EditorIcons.xml

@@ -251,6 +251,10 @@
         <attribute name="Texture" value="Texture2D;Textures/Editor/EditorIcons.png" />
         <attribute name="Image Rect" value="16 32 30 46" />
     </element>
+    <element type="Selectable">
+        <attribute name="Texture" value="Texture2D;Textures/Editor/EditorIcons.png" />
+        <attribute name="Image Rect" value="16 32 30 46" />
+    </element>
     <element type="HierarchyContainer">
         <attribute name="Texture" value="Texture2D;Textures/Editor/EditorIcons.png" />
         <attribute name="Image Rect" value="16 32 30 46" />