message: test: Fix "echo" subtest in the system_tests for Windows
diff: @@ -58,10 +58,8 @@ BOOST_AUTO_TEST_CASE(run_command)
  }
  {
  #ifdef WIN32
  - // Windows requires single quotes to prevent escaping double quotes from the JSON...
  - const UniValue result = RunCommandParseJSON("echo '{\"success\": true}'");
  + const UniValue result = RunCommandParseJSON("cmd.exe /c echo {\"success\": true}");
  #else
  - // ... but Linux and macOS echo a single quote if it's used
  const UniValue result = RunCommandParseJSON("echo \"{\"success\": true}\"");
  #endif
  BOOST_CHECK(result.isObject());
  