Remove duplicate __all__ declarations in vectorized_mobject.py

[irvanalhaq9]

Overview: What does this pull request change?

This pull request removes duplicate __all__ declarations and redundant entries within the vectorized_mobject.py module. By consolidating the exports list into a single __all__, this change ensures clarity, avoids confusion, and eliminates unnecessary duplication.

Motivation and Explanation: Why and how do your changes improve the library?

Why:
Having multiple __all__ declarations in the same module is unnecessary and can create ambiguity. Moreover, redundant entries such as VectorizedPoint within the list serve no functional purpose and can confuse contributors or maintainers.
By consolidating __all__ into a single declaration and removing duplicates, this change aligns with Python's best practices for maintaining clean and readable code.

How:
This change:
Merges the two __all__ declarations into a single list at the top of the module.
Removes duplicate entries such as VectorizedPoint from the export list.
Ensures the final __all__ is clear, concise, and reflective of intended exports.

Links to added or changed documentation pages

Further Information and Comments

This is a non-breaking, backward-compatible change. It does not modify exported functionality but improves the codebase's maintainability by ensuring consistency and reducing redundancy.
Feedback or further suggestions are welcome!

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[irvanalhaq9]

The __all__ declaration already exists at the top of this file, specifically in lines 5–12.
This duplicate declaration is unnecessary and could lead to confusion. It would be better to consolidate the exports into a single __all__ definition at the beginning of the file. Original declaration in the main branch: vectorized_mobject.py.

[behackl]

Well spotted and thanks for your contribution! This looks fine to me.

[irvanalhaq9]

Thanks