Fix background image URL in lab style

Author: ecloude

_includes/lab-background-style.html

@@ -53,7 +53,7 @@
             rgba(13, 13, 13, 0) 0%, 
             rgba(13, 13, 13, 1) 100% 
         ), 
-        url("{{ '/assets/images/clouds-lab.png' | relative_url }}") !important; 
+        url("{{ '/assets/images/clouds_lab.png' | relative_url }}") !important; 
 
     background-attachment: fixed !important;
     background-position: center top !important;