Fix malformed favicon link path

- Correct /assets/graphicsfavicon/ to /assets/graphics/favicon/
- Adds missing slash between 'graphics' and 'favicon' in favicon-32x32.png link
- Ensures consistent favicon URL structure across all favicon references

This fixes the 404 error for the 32x32 favicon on missingmaps.org

Author: Dale Kunce

app/_layouts/default.html

@@ -40,7 +40,7 @@
   <link rel="icon" type="image/png" href="/assets/graphics/favicon/favicon-160x160.png" sizes="160x160">
   <link rel="icon" type="image/png" href="/assets/graphics/favicon/favicon-96x96.png" sizes="96x96">
   <link rel="icon" type="image/png" href="/assets/graphics/favicon/favicon-16x16.png" sizes="16x16">
-  <link rel="icon" type="image/png" href="/assets/graphicsfavicon/favicon-32x32.png" sizes="32x32">
+  <link rel="icon" type="image/png" href="/assets/graphics/favicon/favicon-32x32.png" sizes="32x32">
 
   <meta name="description" content="Putting the World's Vulnerable People on the Map">
   <meta itemprop="name" content="MissingMaps">