Remove compat option check for prompt parser

from typing import List

import lark

try:

    from modules.shared import opts

except:

    pass

# a prompt like this: "fantasy landscape with a [mountain:lake:0.25] and [an oak:a christmas tree:0.75][ in foreground::0.6][ in background:0.25] [shoddy:masterful:0.5]"

# will be represented with prompt_schedule like this (assuming steps=100):

# [25, 'fantasy landscape with a mountain and an oak in foreground shoddy']

                yield args[0].value

            def __default__(self, data, children, meta):

                for child in children:

                    try:

                        if opts.use_old_prompt_parser_default_step_transformer:

                            yield from child

                        else:

                            yield child

                    except:

                    yield child

        return AtStep().transform(tree)