`VCLXAccessibleToolBoxItem::implGetText` was just calling
`VCLXAccessibleToolBoxItem::GetText`, and both of them
were used from different places.
Just move the implementation to `VCLXAccessibleToolBoxItem::implGetText`
right away, drop `VCLXAccessibleToolBoxItem::implGetText` and adjust
callers to unify this.
Change-Id: I0f4a4652f9e1259826a566d42b4b6998fc8ac7db
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163958
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
