`+latex-indent-item-continuation-offset` seems to only affect `fill-paragraph` but not `latex-indent-line`

### I confirm that...

- [x] I have searched the [issue tracker](https://github.com/doomemacs/doomemacs/issues), [documentation](https://docs.doomemacs.org), [FAQ](https://docs.doomemacs.org/-/faq), [Discourse](https://discourse.doomemacs.org), and [Google](https://google.com), in case this issue has already been reported/resolved.

- [x] I have read "[How to Debug Issues](https://doomemacs.org/d/how2debug)", and will use it to provide as much information about this issue as possible.

- [x] The issue can be reproduced on the **latest** available commit of Doom.

- [x] The issue can be reproduced on a stable release of Emacs, such as 27, 28, or 29. *(Unstable versions end in .50, .60, or .9x)*

### Expected behavior

The same indentation (the second line starts after `\item ` when the variable is set to `'align`) will be produced with either `M-q` or `TAB` for an itemized environment.

### Current behavior

It seems to work with `fill-paragraph`/`LaTeX-fill-paragraph` command, but neither `indent-for-tab-command` (`TAB`) nor `LaTeX-indent-line` seems to be affected by this variable, and starts the next line with 0 indent.

### Steps to reproduce

Write a latex itemized paragraph longer than `fill-column` such as
```latex
\begin{itemized}
\item a a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a aa a a a a
\end{itemized}
```

Hit `M-q` to `fill-paragraph`, observe the second line indented after `\item ` with `'align`.
Hit `TAB` on second line, observe the indentation changes.

### System Information

https://pastebin.com/AqRFtkjX