clang-tidy: use std::move where applicable (#2605)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/dialogs/NotificationPopup.cpp

@@ -45,7 +45,7 @@ void NotificationPopup::updatePosition()
 
 void NotificationPopup::addMessage(MessagePtr msg)
 {
-    this->channel_->addMessage(msg);
+    this->channel_->addMessage(std::move(msg));
 
     //    QTimer::singleShot(5000, this, [this, msg] { this->channel->remove });
 }