gnucash maint: Fix format warnings by importing (ice-9 format)

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/a0a4fc89 (commit)
	from  https://github.com/Gnucash/gnucash/commit/2c8ae267 (commit)



commit a0a4fc89aa29c3e07f8a392ce95362b599e490a6
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Dec 14 06:02:41 2020 +0800

    Fix format warnings by importing (ice-9 format)
    
    and modify untranslated string



Summary of changes:
 gnucash/report/reports/locale-specific/us/taxtxf.scm    | 1 +
 gnucash/report/reports/standard/account-piecharts.scm   | 1 +
 gnucash/report/reports/standard/advanced-portfolio.scm  | 1 +
 gnucash/report/reports/standard/price-scatter.scm       | 1 +
 gnucash/report/reports/standard/test/test-cash-flow.scm | 7 ++++---
 5 files changed, 8 insertions(+), 3 deletions(-)