KVM: selftests: Test MONITOR and MWAIT, not just MONITOR for quirk

Fix a copy+paste error in monitor_mwait_test by switching one of the two
"monitor" instructions to  an "mwait".  The intent of the test is very
much to verify the quirk handles both MONITOR and MWAIT.

Fixes: 2325d4dd73 ("KVM: selftests: Add MONITOR/MWAIT quirk test")
Reported-by: Yuan Yao <yuan.yao@linux.intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220711225753.1073989-2-seanjc@google.com

tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c

@@ -34,7 +34,7 @@ static void guest_monitor_wait(int testcase)
 	else
 		GUEST_ASSERT_2(!vector, testcase, vector);
 
-	vector = kvm_asm_safe("monitor");
+	vector = kvm_asm_safe("mwait");
 	if (fault_wanted)
 		GUEST_ASSERT_2(vector == UD_VECTOR, testcase, vector);
 	else