remove extraneous space from IE conditional statement (#2273)

Author: coliff

_includes/head.html

@@ -14,7 +14,7 @@
 <!-- For all browsers -->
 <link rel="stylesheet" href="{{ '/assets/css/main.css' | relative_url }}">
 
-<!--[if IE ]>
+<!--[if IE]>
   <style>
     /* old IE unsupported flexbox fixes */
     .greedy-nav .site-title {