Fix font-src CSP directive in header (#78)

Author: xblitz

views/header.phtml

@@ -4,7 +4,7 @@
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   <meta
   http-equiv="Content-Security-Policy"
-  content="default-src 'none'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; font-src: 'self'; img-src data: 'self'" />
+  content="default-src 'none'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src data: 'self'" />
 
 	<!-- Meta, title, CSS, favicons, etc. -->
 	<meta charset="utf-8">