patch 8.2.4167: Vim9: error message for old style import

Problem:    Vim9: error message for old style import.
Solution:   Use another error message.  Add a test.
diff --git a/src/errors.h b/src/errors.h
index 7ad1076..3fd265f 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -2966,8 +2966,7 @@
 	INIT(= N_("E1167: Argument name shadows existing variable: %s"));
 EXTERN char e_argument_already_declared_in_script_str[]
 	INIT(= N_("E1168: Argument already declared in the script: %s"));
-EXTERN char e_import_as_name_not_supported_here[]
-	INIT(= N_("E1169: 'import * as {name}' not supported here"));
+// E1169 unused
 EXTERN char e_cannot_use_hash_curly_to_start_comment[]
 	INIT(= N_("E1170: Cannot use #{ to start a comment"));
 EXTERN char e_missing_end_block[]