Map the stopped transceiver direction on Android

Fixes IllegalArgumentException when native calls fromNativeIndex.

Bug: webrtc:14320
Change-Id: I0f0717852abd009e17c6f67639f1bf2262df8dfd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/270622
Commit-Queue: Xavier Lepaul‎ <xalep@webrtc.org>
Reviewed-by: Xavier Lepaul‎ <xalep@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37694}

sdk/android/api/org/webrtc/RtpTransceiver.java

@@ -38,7 +38,8 @@ public class RtpTransceiver {
     SEND_RECV(0),
     SEND_ONLY(1),
     RECV_ONLY(2),
-    INACTIVE(3);
+    INACTIVE(3),
+    STOPPED(4);
 
     private final int nativeIndex;