updateStatus: prevent status reduction

A very minor adjustment to ensure the status cannot be downgraded.

Change-Id: I1e0fe5461ad05f5cf9f88174b4253e0e63caa3bd

src/libclient/messagelistmodel.cpp

@@ -223,7 +223,7 @@ MessageListModel::updateStatus(const QString& id,
         return false;
     }
     VectorInt roles;
-    if (it->second.status == newStatus) {
+    if (it->second.status >= newStatus) {
         return false;
     }
     it->second.status = newStatus;