dcsctp: Fix typo for handing I-FORWARD-TSN.

This was found during code review. This code is essentially dead code
until interleaved messaging is implemented, which is disabled both in
configuration and due to missing code.

Bug: None
Change-Id: Idea87dfe2be204361774d8964140fd9947a66410
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/261944
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36850}

net/dcsctp/socket/dcsctp_socket.cc

@@ -802,7 +802,7 @@ bool DcSctpSocket::Dispatch(const CommonHeader& header,
       HandleIData(header, descriptor);
       break;
     case IForwardTsnChunk::kType:
-      HandleForwardTsn(header, descriptor);
+      HandleIForwardTsn(header, descriptor);
       break;
     default:
       return HandleUnrecognizedChunk(descriptor);