LibWeb/Fetch: Correct check for X-Method-Override

Previously the code was checking for X-Method.

See:
 - http://wpt.live/fetch/api/basic/request-forbidden-headers.any.html

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp

@@ -725,7 +725,7 @@ bool is_forbidden_request_header(Header const& header)
     if (name.is_one_of_ignoring_ascii_case(
             "X-HTTP-Method"sv,
             "X-HTTP-Method-Override"sv,
-            "X-Method"sv)) {
+            "X-Method-Override"sv)) {
         // 1. Let parsedValues be the result of getting, decoding, and splitting value.
         auto parsed_values = get_decode_and_split_header_value(header.value);