Correctly match * as a host-part. (#657)

This PR adds support for `*` to the `host-part` matching
algorithm, allowing patterns like `https://*:123` to correctly
match any host.

index.bs

@@ -4015,18 +4015,20 @@ this algorithm returns normally if compilation is allowed, and throws a
   <ol class="algorithm">
     1. If |host| is not a [=domain=], return "`Does Not Match`".
 
-    2.  If |pattern| <a>starts with</a> "`*.`":
+    2. If |pattern| is "`*`", return "`Matches`".
+
+    3.  If |pattern| <a>starts with</a> "`*.`":
 
         1.  Let |remaining| be |pattern| with the leading U+002A (`*`) removed and <a>ASCII lowercased</a>.
 
         2.  If |host| to <a>ASCII lowercase</a> <a>ends with</a> |remaining|, then return "`Matches`".
 
         3.  Return "`Does Not Match`".
 
-    3.  If |pattern| is not an <a>ASCII case-insensitive</a> match for |host|, return
+    4.  If |pattern| is not an <a>ASCII case-insensitive</a> match for |host|, return
         "`Does Not Match`".
 
-    4.  Return "`Matches`".
+    5.  Return "`Matches`".
   </ol>
 
   <h5 id="match-ports" algorithm>