Fix the link preview insert lambda to make sure that it doesn't crash

Fix the link preview insert lambda to make sure that it doesn't crash and also make sure that the system doesn't lock up on link preview load

src/messagecontent/models/messagecontentmodel.cpp

@@ -259,7 +259,7 @@ MessageComponent MessageContentModel::linkPreviewComponent(const QUrl &link)
                     it->type = MessageComponentType::LinkPreview;
                     Q_EMIT dataChanged(index(it - m_components.begin()), index(it - m_components.begin()), {ComponentTypeRole});
                 }
-                return it;
+                return ++it;
             });
         }
     });