Fix remote_adb_setup with new `pub run sky_tools run_mojo` command.

It uses a different port.

BUG=
R=qsr@chromium.org

Review URL: https://codereview.chromium.org/1364183004 .

Cr-Mirrored-From: https://github.com/domokit/mojo
Cr-Mirrored-Commit: 03531a0bcb322e0736eed66b091d200d6bb500f7

remote_adb_setup

diff --git a/remote_adb_setup b/remote_adb_setup
index df3176d..aa67d6f 100755
--- a/remote_adb_setup
+++ b/remote_adb_setup
@@ -43,11 +43,13 @@
 #   5037: adb
 # and from the local host to the remote host:
 #   9998: http server for Sky
-#   31840: http server for the local mojo: origin
 #   31839: http server for https://core.mojoapps.io
+#   31840: http server for the local mojo: origin
+#   31841: http server for base mappings
 ssh -C \
     -R 5037:127.0.0.1:5037 \
     -L 9998:127.0.0.1:9998 \
     -L 31839:127.0.0.1:31839 \
     -L 31840:127.0.0.1:31840 \
+    -L 31841:127.0.0.1:31841 \
     "$remote_host"