Fixed resetting folder sync state

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -426,7 +426,6 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
 
                             for (EntityFolder folder : db.folder().getFolders(accountNetworkState.accountState.id, false, false)) {
                                 db.folder().setFolderState(folder.id, null);
-                                db.folder().setFolderSyncState(folder.id, null);
                                 db.folder().setFolderPollCount(folder.id, 0);
                             }