fix:check accounts: don't garble non-ascii account names in errors [#2469]

This regressed in 1.27 or so.

hledger-lib/Hledger/Data/JournalChecks.hs

@@ -63,11 +63,11 @@ journalCheckAccounts j = mapM_ checkacct (journalPostings j)
            "%s:%d:"
           ,"%s"
           ,"Strict account checking is enabled, and"
-          ,"account %s has not been declared."
+          ,"account \"%s\" has not been declared."
           ,"Consider adding an account directive. Examples:"
           ,""
           ,"account %s"
-          ]) f l ex (show a) a
+          ]) f l ex a a
         where
           (f,l,_mcols,ex) = makePostingAccountErrorExcerpt p
 

hledger/test/errors/accounts.j

@@ -1,4 +1,4 @@
 #!/usr/bin/env -S hledger check accounts -f
 
 2022/1/1
-  (a)  1
+  (ß)  1

hledger/test/errors/accounts.test

@@ -1,13 +1,13 @@
 $$$ hledger check accounts -f accounts.j
 >>>2 /Error: .*accounts.j:4:
   \| 2022-01-01
-4 \|     \(a\)               1
+4 \|     \(ß\)               1
   \|      \^
 
 Strict account checking is enabled, and
-account "a" has not been declared.
+account "ß" has not been declared.
 Consider adding an account directive. Examples:
 
-account a
+account ß
 /
 >>>= 1