Show disabled trust agents as off.

When trust agents are disabled by the admin
show the greyed out toggle as off.

Bug: 22397930
Change-Id: I687a5dee0ca9bed5015a4af080270f7bafa5a37d

src/com/android/settings/TrustAgentSettings.java

@@ -113,6 +113,7 @@ public class TrustAgentSettings extends SettingsPreferenceFragment implements
 
             if (disabledByDevicePolicy
                     && mDpm.getTrustAgentConfiguration(null, agent.component) == null) {
+                preference.setChecked(false);
                 preference.setEnabled(false);
                 preference.setSummary(R.string.trust_agent_disabled_device_admin);
             }