[libhandy] combo-row: Use a double value for opacity

[Alexander Mikhaylenko <alexm src gnome org>]

commit a7cfd93f3c9a85e6af2cd0a581953809e99e5afc
Author: Xℹ Ruoyao <xry111 mengyan1223 wang>
Date:   Sat Oct 31 22:52:27 2020 +0800

    combo-row: Use a double value for opacity
    
    Fixes a test failure on x86.

 src/hdy-combo-row.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/hdy-combo-row.c b/src/hdy-combo-row.c
index d60a7e7f..cd9405f5 100644
--- a/src/hdy-combo-row.c
+++ b/src/hdy-combo-row.c
@@ -137,7 +137,7 @@ create_list_widget (gpointer item,
   GtkWidget *checkmark = g_object_new (GTK_TYPE_IMAGE,
                                        "halign", GTK_ALIGN_START,
                                        "icon-name", "emblem-ok-symbolic",
-                                       "opacity", 0,
+                                       "opacity", 0.0,
                                        "valign", GTK_ALIGN_CENTER,
                                        "visible", TRUE,
                                        NULL);