Fix test-cashflow-barchart.scm for guile 2.2

At the same time enable guile 2.2 for our arch ci test
so gnucash gets ci testing with that version as well

gnucash/report/report-system/html-barchart.scm

@@ -452,7 +452,7 @@
                    },
                    series: series,
                    axesDefaults: {
-                   },        
+                   },
                    grid: {
                    },
                    axes: {

gnucash/report/standard-reports/test/test-cashflow-barchart.scm

@@ -35,6 +35,8 @@
 (use-modules (ice-9 streams))
 (use-modules (srfi srfi-1))
 
+;; Explicitly set locale to make the report output predictable
+(setlocale LC_ALL "C")
 
 (define (run-test)
   (logging-and (test-in-txn)

util/ci/arch-docker

@@ -1,5 +1,5 @@
 from base/archlinux
-run pacman -Syu --quiet --noconfirm gcc cmake make boost python2 pkg-config guile2.0 guile git ninja gtest gmock sqlite3 webkit2gtk swig gwenhywfar aqbanking intltool libxslt postgresql-libs libmariadbclient libdbi libdbi-drivers > /dev/null
+run pacman -Syu --quiet --noconfirm gcc cmake make boost python2 pkg-config guile git ninja gtest gmock sqlite3 webkit2gtk swig gwenhywfar aqbanking intltool libxslt postgresql-libs libmariadbclient libdbi libdbi-drivers > /dev/null
 run echo en_US.UTF-8 UTF-8 >> /etc/locale.gen
 run echo en_GB.UTF-8 UTF-8 >> /etc/locale.gen
 run echo fr_FR.UTF-8 UTF-8 >> /etc/locale.gen