[Fix] Fix dtype error in StableDiffusion and DreamBooth training

[LeoXing1996]

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Motivation

Fix #1867

Modification

As title.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage: 42.85% and project coverage change: -0.02 ⚠️

Comparison is base (47a54de) 83.02% compared to head (a0ce951) 83.00%.

❗ Current head a0ce951 differs from pull request most recent head 7e5fc1a. Consider uploading reports for the commit 7e5fc1a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1879      +/-   ##
==========================================
- Coverage   83.02%   83.00%   -0.02%     
==========================================
  Files         411      411              
  Lines       27598    27603       +5     
  Branches     4314     4316       +2     
==========================================
+ Hits        22912    22913       +1     
- Misses       3752     3754       +2     
- Partials      934      936       +2     

Flag	Coverage Δ
unittests	83.00% <42.85%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...odels/editors/stable_diffusion/stable_diffusion.py	59.32% <42.85%> (-0.86%)	⬇️

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