[gnome-mines] Added set_image() call. Fixes bug #781602 and #778408.

[Robert Roth <robertroth src gnome org>]

commit efd335c10dba10c03fdddec74c37468ae3bde423
Author: Daiki Matsunaga <matsu d 224 icloud com>
Date:   Sat Apr 29 15:49:48 2017 +0900

    Added set_image() call. Fixes bug #781602 and #778408.

 src/tile.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/tile.vala b/src/tile.vala
index 7a40b1d..e9e6acf 100644
--- a/src/tile.vala
+++ b/src/tile.vala
@@ -29,6 +29,7 @@ public class Tile : Gtk.Button
         scaling_image.clear ();
         scaling_image.set_from_icon_name (name, size);
         scaling_image.set_pixel_size (get_allocated_height ()/3*2);
+        set_image (scaling_image);
     }
 
     public Tile (int prow, int pcol)
@@ -66,6 +67,7 @@ public class Tile : Gtk.Button
         if (style_class in IMAGE_CLASSES) {
             scaling_image.set_from_icon_name (style_class, Gtk.IconSize.DND);
             scaling_image.set_pixel_size (get_allocated_height ()/3*2);
+            set_image (scaling_image);
         }
     }