AK+LibWeb: Add a UTF-16 starts/ends with wrapper for a single code unit

Author: https://github.com/trflynn89
Commit: 1bc80848fb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5746
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/HTML/Scripting/ImportMap.cpp

@@ -163,7 +163,7 @@ WebIDL::ExceptionOr<ModuleSpecifierMap> sort_and_normalise_module_specifier_map(
         }
 
         // 6. If specifierKey ends with U+002F (/), and the serialization of addressURL does not end with U+002F (/), then:
-        if (specifier_key.as_string().view().ends_with("/"sv) && !address_url->serialize().ends_with('/')) {
+        if (specifier_key.as_string().view().ends_with('/') && !address_url->serialize().ends_with('/')) {
             // 1. The user agent may report a warning to the console indicating that an invalid address was given for the specifier key specifierKey; since specifierKey ends with a slash, the address needs to as well.
             auto& console = realm.intrinsics().console_object()->console();
             console.output_debug_message(JS::Console::LogLevel::Warn,