Remove the useless mts tag since the tests only contain in one MTS module test plan. am: 95fb0801bf

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3363287

Change-Id: I58c5c8da3fef2290383c4dc93e4f08b1d2c76947
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>