Everywhere: Remove the AK:: qualifier from Stream usages

Author: https://github.com/timschumi
Commit: 43f98ac6e1
Pull-request: https://github.com/SerenityOS/serenity/pull/17406
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibProtocol/Request.cpp

@@ -20,7 +20,7 @@ bool Request::stop()
     return m_client->stop_request({}, *this);
 }
 
-void Request::stream_into(AK::Stream& stream)
+void Request::stream_into(Stream& stream)
 {
     VERIFY(!m_internal_stream_data);