[Fix] Make SearchPopup a BasePopup (#2182)

src/widgets/helper/SearchPopup.cpp

@@ -52,7 +52,8 @@ ChannelPtr SearchPopup::filter(const QString &text, const QString &channelName,
     return channel;
 }
 
-SearchPopup::SearchPopup()
+SearchPopup::SearchPopup(QWidget *parent)
+    : BasePopup({}, parent)
 {
     this->initLayout();
     this->resize(400, 600);

src/widgets/helper/SearchPopup.hpp

@@ -15,7 +15,7 @@ namespace chatterino {
 class SearchPopup : public BasePopup
 {
 public:
-    SearchPopup();
+    SearchPopup(QWidget *parent);
 
     virtual void setChannel(const ChannelPtr &channel);
     virtual void setChannelFilters(FilterSetPtr filters);

src/widgets/splits/Split.cpp

@@ -828,7 +828,7 @@ const QList<QUuid> Split::getFilters() const
 
 void Split::showSearch()
 {
-    SearchPopup *popup = new SearchPopup();
+    SearchPopup *popup = new SearchPopup(this);
 
     popup->setChannelFilters(this->view_->getFilterSet());
     popup->setAttribute(Qt::WA_DeleteOnClose);