AK: Allow case-insensitive FlyString/StringView comparison

Author: https://github.com/AtkinsSJ
Commit: f527e55046
Pull-request: https://github.com/SerenityOS/serenity/pull/20945
Reviewed-by: https://github.com/shannonbooth

AK/FlyString.cpp

@@ -190,4 +190,9 @@ bool FlyString::equals_ignoring_ascii_case(FlyString const& other) const
     return StringUtils::equals_ignoring_ascii_case(bytes_as_string_view(), other.bytes_as_string_view());
 }
 
+bool FlyString::equals_ignoring_ascii_case(StringView other) const
+{
+    return StringUtils::equals_ignoring_ascii_case(bytes_as_string_view(), other);
+}
+
 }