Enumeration format not customizable in PDF export via LaTeX

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Describe the bug
When exporting to PDF via LaTeX, the enumerates are hardcoded with \def\labelenumi{\arabic{enumi}.} or \def\labelenumii{\arabic{enumii}.}, preventing users from overwriting them using \renewcommand in YAML header-includes without manually editing the exported LaTeX file.

To Reproduce
Steps to reproduce the behavior:

1. Open a Markdown file containing enumerated lists.
2. Add the following lines to the YAML header-includes section of the Markdown file:

header-includes: |
  \renewcommand{\labelenumi}{(\alph{enumi})}
  \renewcommand{\labelenumii}{(\roman{enumii})}

3. Export the file to PDF via LaTeX.
4. Observe that the enumeration format remains unchanged in the exported PDF, disregarding the modifications specified in the YAML header-includes.

Expected behavior
Users should be able to customize the enumeration format using \renewcommand in the Markdown file, and the modifications should be reflected in the exported PDF.

Screenshots / Screencasts
N/A

Sample Markdown File
Please attach or send us hi@typora.io the sample md file that may reproduce this.

Desktop (please complete the following information):

• OS: Windows 10 64bit

Typora Version
1.8.10

Additional context
This issue affects users who rely on LaTeX for PDF export and need to customize the enumeration format. Currently, users have to manually edit the exported LaTeX file to make the desired modifications, which is inconvenient and defeats the purpose of using Markdown for seamless document creation.