resetting cursor position if somehow leaves the window in panning mode

If the mouse DPI is high enough or the rendering window size is small enough the mouse cursor can leave the window, which can cause some annoying behavior, just in case a workaround for that issue.

src/yuzu/main.h

@@ -328,6 +328,7 @@ private:
     void UpdateUISettings();
     void HideMouseCursor();
     void ShowMouseCursor();
+    void CenterMouseCursor();
     void OpenURL(const QUrl& url);
     void LoadTranslation();
     void OpenPerGameConfiguration(u64 title_id, const std::string& file_name);
@@ -372,6 +373,7 @@ private:
     bool auto_paused = false;
     bool auto_muted = false;
     QTimer mouse_hide_timer;
+    QTimer mouse_center_timer;
 
     // FS
     std::shared_ptr<FileSys::VfsFilesystem> vfs;
@@ -418,4 +420,5 @@ protected:
     void dropEvent(QDropEvent* event) override;
     void dragEnterEvent(QDragEnterEvent* event) override;
     void dragMoveEvent(QDragMoveEvent* event) override;
+    void leaveEvent(QEvent* event) override;
 };