[gnome-calendar] quick-add-popover: add a styleclass to color_image

[Lapo Calamandrei <lapo src gnome org>]

commit 2234ef0854fb4b52bf4a62073bd0a27133c52936
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Fri Jul 8 19:06:50 2016 +0200

    quick-add-popover: add a styleclass to color_image
    
    add the `calendar-color-image` styleclass to the color_image image
    to be able to style it generally.

 data/ui/quick-add-popover.ui |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/data/ui/quick-add-popover.ui b/data/ui/quick-add-popover.ui
index baee97f..8684bba 100644
--- a/data/ui/quick-add-popover.ui
+++ b/data/ui/quick-add-popover.ui
@@ -67,6 +67,9 @@
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
                         <property name="stock">gtk-missing-image</property>
+                        <style>
+                          <class name="calendar-color-image"/>
+                        </style>
                       </object>
                       <packing>
                         <property name="expand">False</property>