[metacity] metaaccellabel: avoid implicit conversion warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 453faa20b262f4bb20fa0b5fd9389a7fb16e0921
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 11 13:55:23 2018 +0200

    metaaccellabel: avoid implicit conversion warning
    
    warning: implicit conversion from ‘gfloat {aka float}’ to ‘double’
    to match other operand of binary expression [-Wdouble-promotion]

 src/ui/metaaccellabel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ui/metaaccellabel.c b/src/ui/metaaccellabel.c
index 48f562e..8e6f2a4 100644
--- a/src/ui/metaaccellabel.c
+++ b/src/ui/metaaccellabel.c
@@ -258,7 +258,7 @@ meta_accel_label_draw (GtkWidget *widget,
       GtkLabel *label = GTK_LABEL (widget);
       gint x, y, xpad, ypad;
       gint margin_start, margin_end, margin_top, margin_bottom;
-      gfloat yalign;
+      gdouble yalign;
 
       label_layout = gtk_label_get_layout (GTK_LABEL (accel_label));
       yalign = gtk_label_get_yalign (GTK_LABEL (accel_label));