Fix dangling annotation tooltip
If users activate an annotation tool while an annotation tooltip is displayed, the tooltip will be shown everywhere in the page.
Steps to Reproduce:
- open a PDF file in okular
- activate an annotation tool (eg. alt+1)
- annotate the file
- deactivate the annotation tool (eg. press ESC)
- place the mouse over the annotation and wait for the tooltip
- activate an annotation tool (eg. alt+1)
- move mouse to any other element in the view