manifest: disable global commit_msg_test_field repohook check

stop requiring Test: in commit message this is useless
for us

Change-Id: I4a6a59cf31cf187f8ff93c7993f7106ec684667a

GLOBAL-PREUPLOAD.cfg

@@ -6,7 +6,7 @@
 ignore_merged_commits = true
 
 [Builtin Hooks]
-commit_msg_test_field = true
+commit_msg_test_field = false
 
 [Tool Paths]
 clang-format = ${REPO_ROOT}/prebuilts/clang/host/${BUILD_OS}/clang-stable/bin/clang-format