When hovering the mouse over the X symbol to close a note the cursor remains the same of the current shape (hand, selection cursor) based on the tool selected.
This patch morphe the cursor to the standard arrow over the X symbol to close a note by adding setCursor() call in the CloseButton constructor
[[ https://bugs.kde.org/show_bug.cgi?id=384381 | BUG: 384381 ]]