Revert "init: disable oneshot_on test"

This reverts commit d30c51157e.

This test wasn't flaky, it was failing when not run as root, but that
has been fixed.

Bug: 152630580
Bug: 152637928
Test: this test is okay now
Change-Id: I3b20be2839dae90ffc6a8eeea68f36e532060af1

init/oneshot_on_test.cpp

@@ -25,7 +25,6 @@ using android::base::SetProperty;
 using android::base::WaitForProperty;
 using namespace std::literals;
 
-#if 0  // TODO(b/152637928): this test is flaky
 TEST(init, oneshot_on) {
     if (getuid() != 0) {
         GTEST_SKIP() << "Skipping test, must be run as root.";
@@ -48,4 +47,3 @@ TEST(init, oneshot_on) {
     // Now that oneshot is enabled again, bootanim should transition into the 'stopped' state.
     EXPECT_TRUE(WaitForProperty("init.svc.bootanim", "stopped", 10s));
 }
-#endif