HoverHandler.cursorShape is new API in 5.15, so we have to use
MouseArea for 5.14.

This patch can be reverted as soon as 5.14 is no longer supported.

Change-Id: I1c830215729038095ec33ece36a1a83108cbd835
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>