gnucash maint: Restore Scheme definitions of GNC-COMMODITY-NS-CURRENCY & -NONCURRENCY.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/1373233c (commit)
	from  https://github.com/Gnucash/gnucash/commit/19479c3a (commit)



commit 1373233cd05c0e9806f586fd53a55d561255f650
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Mar 11 11:57:48 2022 -0800

    Restore Scheme definitions of GNC-COMMODITY-NS-CURRENCY & -NONCURRENCY.
    
    Overzealously removed in PR 1073.



Summary of changes:
 bindings/guile/engine.scm | 3 +++
 1 file changed, 3 insertions(+)