[sysprof] style: fix typo

[Christian Hergert <chergert src gnome org>]

commit 8600ce0c1d3c1c35261ac1c1636f5847f314e22a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Dec 12 21:49:16 2018 -0800

    style: fix typo

 lib/resources/css/SpVisualizerView-Adwaita-dark.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/lib/resources/css/SpVisualizerView-Adwaita-dark.css 
b/lib/resources/css/SpVisualizerView-Adwaita-dark.css
index fe06f50..2848453 100644
--- a/lib/resources/css/SpVisualizerView-Adwaita-dark.css
+++ b/lib/resources/css/SpVisualizerView-Adwaita-dark.css
@@ -1,5 +1,5 @@
 visualizers list row {
-  background-color: ##201f21;
+  background-color: #201f21;
   background-size: 8px 8px;
   background-image: repeating-linear-gradient(0deg, #232224, #232224 1px, transparent 1px, transparent 8px),
                     repeating-linear-gradient(-90deg, #232224, #232224 1px, transparent 1px, transparent 
8px);