Print: enable printing with the new profile

Some weird things happen if we use a local instance of the
ProfileWidget2 class in printProfileDives(). Once we
exit the printing dialog the profile crashes, which could
hint of singleton issues.

Instead we are going to use the already active instance of
the class which we can retrieve from MainWindow. This should
also be faster because the class is pretty heavy.

In such a case the cleanup at the end of printProfileDives()
is still relevant (removed in ac9a23ef3b69). First we
resize the widget for printing purposes and then resize it
back to the original values and re-plot the current selected
dive in the dive list.

Fixes #477, #478

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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