Log screen lock settings using its own constant

Bug: 32953042
Test: manual
Change-Id: Ic72a2b0e7d2a176e03f5e1f39e09b09430268e64

tests/robotests/src/com/android/settings/security/screenlock/ScreenLockSettingsTest.java

@@ -48,7 +48,8 @@ public class ScreenLockSettingsTest {
 
     @Test
     public void verifyConstants() {
-        assertThat(mSettings.getMetricsCategory()).isEqualTo(MetricsProto.MetricsEvent.SECURITY);
+        assertThat(mSettings.getMetricsCategory())
+                .isEqualTo(MetricsProto.MetricsEvent.SCREEN_LOCK_SETTINGS);
         assertThat(mSettings.getPreferenceScreenResId()).isEqualTo(R.xml.screen_lock_settings);
     }