vcl: Consistently use pMenuBarWindow in MenuBar::ImplCreate

Use `pWindow` only to assign initial value to
`pMenuBarWindow`, then consistently use only the latter
instead of keeping both in sync and using interchangeably.

This also prepares for changing the `pWindow` param
from `vcl::Window*` to `MenuBarWindow*` in an upcoming
commit without upsetting clang plugins.

Change-Id: I07482e23c365ce39c4aa581fb42bf97ad03f6e1b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177696
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions