Parse `ice_unwritable_timeout` and `ice_unwritable_min_checks` from RTCConfiguration into IceConfig

These two configs are in both RTConfiguration and IceConfig,
but ParseIceConfig() function does not move them.

Bug: webrtc:10079
Change-Id: I11cbedfeabaf77228a253c7bc5e2781b28b08642
Reviewed-on: https://webrtc-review.googlesource.com/c/112546
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Commit-Queue: Qingsi Wang <qingsi@webrtc.org>
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25860}
diff --git a/pc/peerconnection.cc b/pc/peerconnection.cc
index ad8bd1a..c817494 100644
--- a/pc/peerconnection.cc
+++ b/pc/peerconnection.cc
@@ -5212,6 +5212,8 @@
   ice_config.ice_check_interval_weak_connectivity =
       config.ice_check_interval_weak_connectivity;
   ice_config.ice_check_min_interval = config.ice_check_min_interval;
+  ice_config.ice_unwritable_timeout = config.ice_unwritable_timeout;
+  ice_config.ice_unwritable_min_checks = config.ice_unwritable_min_checks;
   ice_config.stun_keepalive_interval = config.stun_candidate_keepalive_interval;
   ice_config.regather_all_networks_interval_range =
       config.ice_regather_interval_range;