The sub-menus were not removed from the maps on which the leaks
appeared on the clean methods of
org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.
Apply similar fix to ToolBarManagerRenderer.

Change-Id: I2527a4fb9b93da3ff3ae99136f844e45218ab63f
Signed-off-by: Axel Richard <axel.richard@obeo.fr>
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>