[guest] Re-enable vsock integration test

Flakiness has been resolved in changes:
Ie3cea59815a6a05bf4f2237f3012d6efcfc92d4e
I01dd1d878d9db6042e4c2774bec41d5129899780

MAC-237 #done

Test: fx run-test guest_integration_tests -- --gtest_filter=VsockGuestTest.ConnectDisconnect --gtest_repeat=200
Change-Id: Iee11d0d3512d0859699042a79564d9ef2328688c
diff --git a/garnet/bin/guest/integration/virtio_vsock_tests.cc b/garnet/bin/guest/integration/virtio_vsock_tests.cc
index 4812234..07b4db4 100644
--- a/garnet/bin/guest/integration/virtio_vsock_tests.cc
+++ b/garnet/bin/guest/integration/virtio_vsock_tests.cc
@@ -125,8 +125,7 @@
 
 using VsockGuestTest = GuestTest<ZirconVsockGuestTest>;
 
-// Disabled due to flake: MAC-237
-TEST_F(VsockGuestTest, DISABLED_ConnectDisconnect) {
+TEST_F(VsockGuestTest, ConnectDisconnect) {
   auto handle = std::async(std::launch::async,
                            [this] { this->GetEnclosedGuest()->TestThread(); });