Simplify parser error detection in testcase

- After the GitHub macOS runner images were upgraded to macOS 14.6
  (Sonoma), the test 'Include remote rules - failed download (Abort)'
  started failing because the error message reported by curl/OS is no
  longer 'HTTP response code said error'.

Author: eduar-hte

test/test-cases/regression/config-secremoterules.json

@@ -46,7 +46,7 @@
     "version_min":300000,
     "title":"Include remote rules - failed download (Abort)",
     "expected":{
-      "parser_error": "Failed to download: HTTP response code said error"
+      "parser_error": "Failed to download"
     },
     "rules":[
       "SecRuleEngine On",