[roll] Roll fuchsia [lowpan-ot-driver] Only update OpenThread settings once at startup.

During testing we will sometimes update these values before joining
a network, causing them to be overwritten. This change should help
improve testing.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/706966
Original-Revision: ab43943c9f8d480e6c850f0c42c80beaacbf34fe
GitOrigin-RevId: 67a73676b65ffeda5be32aec7be4a6a50aa6ad68
Change-Id: I5c845366673d9e297e531664c3f7f4416e45a140
diff --git a/stem b/stem
index c50e4b5..db6d4ef 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="299063987fb20ab5862657f14e8c32293b538806"/>
+             revision="ab43943c9f8d480e6c850f0c42c80beaacbf34fe"/>
   </projects>
   <hooks>
     <hook name="install-environment"