Qt: Search more things! (#3414)

Co-authored-by: KrossX <2485237+krossx@users.noreply.github.com>

src/duckstation-qt/gamelistwidget.cpp

@@ -970,7 +970,10 @@ public:
     if (m_filter_region != DiscRegion::Count && entry->region != m_filter_region)
       return false;
 
-    if (!m_filter_name.isEmpty() && !QString::fromStdString(entry->title).contains(m_filter_name, Qt::CaseInsensitive))
+    if (!m_filter_name.isEmpty() &&
+          !QString::fromStdString(entry->path).contains(m_filter_name, Qt::CaseInsensitive) &&
+          !QString::fromStdString(entry->serial).contains(m_filter_name, Qt::CaseInsensitive) &&
+          !QString::fromStdString(entry->title).contains(m_filter_name, Qt::CaseInsensitive))
       return false;
 
     return QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent);