fix #1015 (again)
fix #1015 (again)

To allow the text in the draggable posting div to be selectable, toggle
the draggable state on mouseover.

aumayr/beancount-web,beancount/fava,aumayr/beancount-web,yagebu/fava,beancount/fava,yagebu/fava,beancount/fava,yagebu/fava,yagebu/fava,beancount/fava,aumayr/beancount-web,beancount/fava,yagebu/fava,aumayr/beancount-web