fix(backend): child widget type does not handle

[Yazawazi]

The backend does not handle the type of child widget, which can make the rendering of widgets in simple or sheet not conform to expectations.

You can reproduce this problem.

Python Code:

from typing import List
from pydatafront.decorator import textea_export

@textea_export(
    path="backend",
    description="reproduce",
    a={
        "treat_as": "column",
        "widget": "switch"
    }
)
def backend(a: List[bool]):
    return {
        "result": a
    }

After fixing:

[vercel[bot]]

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