fix template script that should be loaded to a dict from a json file

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 :tada:

Comparison is base (8e03205) 87.90% compared to head (3921984) 87.93%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #150 +/- ## ========================================== + Coverage 87.90% 87.93% +0.02% ========================================== Files 79 79 Lines 3786 3787 +1 ========================================== + Hits 3328 3330 +2 + Misses 458 457 -1 ``` | [Impacted Files](https://codecov.io/gh/deepmodeling/dpgen2/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling) | Coverage Δ | | |---|---|---| | [dpgen2/entrypoint/args.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2VudHJ5cG9pbnQvYXJncy5weQ==) | `90.98% <100.00%> (ø)` | | | [dpgen2/entrypoint/submit.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/150?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2VudHJ5cG9pbnQvc3VibWl0LnB5) | `71.32% <100.00%> (+0.48%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling)

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