rtp_engine: Remove the double assigned RTP payload ID of H.263+.

Mantis-3709 (Commit 68ff3c3, Asterisk 1.2) added support for the video format
H.263+. For this, the RTP payload ID 103 got assigned statically. Commit f1aadc8
assigned another payload ID 98 for this format in Asterisk 1.6.

Change-Id: I90e35b158487f8f1f8187da6241b54cd3b74e667

main/rtp_engine.c

@@ -2755,7 +2755,7 @@ int ast_rtp_engine_init(void)
 	add_static_payload(31, ast_format_h261, 0);
 	add_static_payload(34, ast_format_h263, 0);
 	add_static_payload(97, ast_format_ilbc, 0);
-	add_static_payload(98, ast_format_h263p, 0);
+
 	add_static_payload(99, ast_format_h264, 0);
 	add_static_payload(101, NULL, AST_RTP_DTMF);
 	add_static_payload(102, ast_format_siren7, 0);