gnucash maint: Fix guile-2.2 syntax error

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/8a0f9c55 (commit)
	from  https://github.com/Gnucash/gnucash/commit/0b0e96c5 (commit)



commit 8a0f9c55f4b43f650bb4d5937c7907506c6020e2
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Jan 14 23:19:12 2021 +0800

    Fix guile-2.2 syntax error
    
    6605a6eb6 had syntax error in guile-2.2; guile-3.0 is more lenient:
    
    definition in expression context, where definitions are not allowed



Summary of changes:
 gnucash/report/reports/standard/category-barchart.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)