Remove deprecated include

src/mainwindow.cpp

@@ -17,7 +17,7 @@
  * along with Danbooru Client. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <KStatusBar>
+// Qt
 
 #include <QAction>
 #include <QQuickWidget>
@@ -31,6 +31,9 @@
 #include <QQuickItem>
 #include <QFileDialog>
 #include <QSortFilterProxyModel>
+#include <QStatusBar>
+
+// KF5
 
 #include <kactioncollection.h>
 #include <KStandardAction>
@@ -42,6 +45,8 @@
 #include <KIO/FileCopyJob>
 #include <KIO/MimetypeJob>
 
+// Own
+
 #include "libdanbooru/danbooruservice.h"
 #include "libdanbooru/danboorupost.h"
 #include "libdanbooru/danboorupool.h"