Fix spurious "ADB not enabled" warning.

The "ADB not enabled" message did not take into account the
vsock_half_tunnel mode, which is now the default.

Test: Build and run
Change-Id: Iaaef5226dfceb435b746ef14e7c66141e053f735
diff --git a/host/commands/launch/launch.cc b/host/commands/launch/launch.cc
index 02aff9f..f247789 100644
--- a/host/commands/launch/launch.cc
+++ b/host/commands/launch/launch.cc
@@ -101,7 +101,7 @@
 
 void ValidateAdbModeFlag(const vsoc::CuttlefishConfig& config) {
   if (!AdbUsbEnabled(config) && !AdbTunnelEnabled(config)
-      && !AdbVsockTunnelEnabled(config)) {
+      && !AdbVsockTunnelEnabled(config) && !AdbVsockHalfTunnelEnabled(config)) {
     LOG(INFO) << "ADB not enabled";
   }
 }