Reducing the freeze error threshold from 1200ms to 1000 ms

Each Eclipse release gets faster so we should reducing the error
threshold for a UI freeze. In general I think 800ms would be good value
but I don't think we are there yet, so "only" reducing the error
threshold to one second.

bundles/org.eclipse.ui.monitoring/src/org/eclipse/ui/internal/monitoring/preferences/MonitoringPreferenceInitializer.java

@@ -30,7 +30,7 @@ public void initializeDefaultPreferences() {
 
 		store.setDefault(PreferenceConstants.MONITORING_ENABLED, false);
 		store.setDefault(PreferenceConstants.LONG_EVENT_WARNING_THRESHOLD_MILLIS, 500); // 0.5 sec
-		store.setDefault(PreferenceConstants.LONG_EVENT_ERROR_THRESHOLD_MILLIS, 1200); // 2 sec
+		store.setDefault(PreferenceConstants.LONG_EVENT_ERROR_THRESHOLD_MILLIS, 1000); // 2 sec
 		store.setDefault(PreferenceConstants.MAX_STACK_SAMPLES, 3);
 		store.setDefault(PreferenceConstants.DEADLOCK_REPORTING_THRESHOLD_MILLIS,
 				5 * 60 * 1000); // 5 min