[463669] Modify DiagramPrintTest to use the print menu

In Mars M6, the print button is no more added to the toolbar by default.

Bug: 463669
Change-Id: Ica67aa7e0278d839fb41a0a08b3a3cb2d76ab550
Signed-off-by: Maxime Porhel <maxime.porhel@obeo.fr>
1 file changed