[geary/ricotz/vala] Don't use unsupported vala syntax

[Rico Tzschichholz <ricotz src gnome org>]

commit 0c57eed50b54176e4c5c54cd90c244bd9f5a7f7a
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Jul 2 15:32:22 2020 +0200

    Don't use unsupported vala syntax

 src/client/util/util-avatar.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/client/util/util-avatar.vala b/src/client/util/util-avatar.vala
index a6cd3ee2b..b1a5423e5 100644
--- a/src/client/util/util-avatar.vala
+++ b/src/client/util/util-avatar.vala
@@ -108,7 +108,7 @@ namespace Util.Avatar {
 
     public Gdk.RGBA get_color_for_name(string name) {
         // https://gitlab.gnome.org/Community/Design/HIG-app-icons/blob/master/GNOME%20HIG.gpl
-        const double[,3] GNOME_COLOR_PALETTE = {
+        const double[,] GNOME_COLOR_PALETTE = {
             {  98, 160, 234 },
             {  53, 132, 228 },
             {  28, 113, 216 },