[SideBars] Don't override cursor on scrollbars in History/Bookmarks sidebars

src/lib/bookmarks/bookmarkstreeview.cpp

@@ -189,7 +189,7 @@ void BookmarksTreeView::mouseMoveEvent(QMouseEvent* event)
                 cursor = Qt::PointingHandCursor;
             }
         }
-        setCursor(cursor);
+        viewport()->setCursor(cursor);
     }
 }
 

src/lib/history/historytreeview.cpp

@@ -149,7 +149,7 @@ void HistoryTreeView::mouseMoveEvent(QMouseEvent* event)
                 cursor = Qt::PointingHandCursor;
             }
         }
-        setCursor(cursor);
+        viewport()->setCursor(cursor);
     }
 }