LibURL: Don't consider file:// URL hosts as always opaque

Which was resulting in file URL hosts not being correctly percent
decoded.

Tests/LibWeb/Text/expected/URL/url.txt

@@ -78,6 +78,16 @@ port => ''
 pathname => '/d:/'
 search => ''
 hash => ''
+new URL('file://a%C2%ADb/p', undefined)
+protocol => 'file:'
+username => ''
+password => ''
+host => 'ab'
+hostname => 'ab'
+port => ''
+pathname => '/p'
+search => ''
+hash => ''
 =========================================
 URL.parse('ftp://serenityos.org:21', undefined)
 protocol => 'ftp:'
@@ -159,3 +169,13 @@ port => ''
 pathname => '/d:/'
 search => ''
 hash => ''
+URL.parse('file://a%C2%ADb/p', undefined)
+protocol => 'file:'
+username => ''
+password => ''
+host => 'ab'
+hostname => 'ab'
+port => ''
+pathname => '/p'
+search => ''
+hash => ''

Tests/LibWeb/Text/input/URL/url.html

@@ -22,6 +22,7 @@
             { input: 'http://serenityos.org/cat?dog#meow"woof' },
             { input: '/hello', base: 'file://friends/' },
             { input: '//d:/..', base: 'file:///C:/a/b' },
+            { input: 'file://a%C2%ADb/p' },
         ];
 
         for (url of urls) {

Userland/Libraries/LibURL/Parser.cpp

@@ -1485,8 +1485,7 @@ URL Parser::basic_parse(StringView raw_input, Optional<URL> const& base_url, Opt
                 // 3. Otherwise, run these steps:
                 else {
                     // 1. Let host be the result of host parsing buffer with url is not special.
-                    // FIXME: It seems we are not passing through url is not special through here
+                    auto host = parse_host(buffer.string_view(), !url->is_special());
-                    auto host = parse_host(buffer.string_view(), true);
 
                     // 2. If host is failure, then return failure.
                     if (!host.has_value())