Rename CLI_ST_PRINT_FREE to CLI_ST_PRINT_DYNERR. Most notably, this highlights that this is reserved to error printing. This is done to ensure consistency between CLI_ST_PRINT/CLI_ST_PRINT_DYN and CLI_ST_PRINT_ERR/CLI_ST_PRINT_DYNERR. The name is also consistent with the function cli_dynerr() which activates it.