[perl-Gtk3] Fix a test failure due to old CSS syntax

[Torsten Schönfeld <tsch src gnome org>]

commit 97095cfb8155c653fc023c1d3e5411b1e4c67b47
Author: Torsten Schönfeld <kaffeetisch gmx de>
Date:   Sun Oct 23 17:03:24 2016 +0200

    Fix a test failure due to old CSS syntax

 t/overrides.t |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/t/overrides.t b/t/overrides.t
index 72fcfe4..b8047bd 100644
--- a/t/overrides.t
+++ b/t/overrides.t
@@ -110,7 +110,7 @@ SKIP: {
     unless Gtk3::CHECK_VERSION (3, 2, 0);
 
   note('Gtk3::CssProvider');
-  my $css = "GtkButton {font: Cantarelll 10}";
+  my $css = "GtkButton {font: 10px Cantarelll}";
   my $expect = qr/Cantarelll/;
   my $p = Gtk3::CssProvider->new;