Don't cancel KeyCachingService if not necessary.

This relates to #12043. There's some xiaomi-specific issue, and this
code was causing a pending intent creation on every app startup,
preventing it from opening. This call shouldn't be necessary unless
screenlock is active.

app/src/main/java/org/thoughtcrime/securesms/service/KeyCachingService.java

@@ -103,7 +103,9 @@ public class KeyCachingService extends Service {
   }
 
   public static void onAppForegrounded(@NonNull Context context) {
-    ServiceUtil.getAlarmManager(context).cancel(buildExpirationPendingIntent(context));
+    if (TextSecurePreferences.isScreenLockEnabled(context) || !TextSecurePreferences.isPasswordDisabled(context)) {
+      ServiceUtil.getAlarmManager(context).cancel(buildExpirationPendingIntent(context));
+    }
   }
 
   public static void onAppBackgrounded(@NonNull Context context) {