[Fix] fix a bug in e2e_hmean_iou_metric.py for in-place filtering bug

[ChuanyangGong]

Motivation

This PR aims to fix a bug in the ABCNet project. The bug occurs when performing in-place filtering on predicted texts, causing subsequent filtering operations to fail.

Modification

The bug is fixed by creating a new list filtered_pred_texts to store the filtered prediction texts, ensuring that the original pred_texts list is not modified in-place.

BC-breaking (Optional)

N/A

Use cases (Optional)

N/A

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.

[CLAassistant]

All committers have signed the CLA.