After the dive log has been closed, the ProfileWidget2 does not clear
the pn2 po2 and ph2 gas line.
This patch cleared the three lines after dive log closed.
Acked-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Hugle <wulong@comp.nus.edu.sg>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>