bug#81628: 30.2; c-ts-mode incorrect indentation for multi-line comments when using tabs (\t)

Hi!

I found the following bug in the c-ts-mode logic that handles indentation
and continuation for multi-line comments (I believe it must be
`c-ts-common-comment-indent-new-line`, but I'm not sure).

It can be reproduced with `emacs -Q`, assuming treesitter grammar for
c-ts-mode is installed:

0. Empty the scratch buffer.
1. M-x c-ts-mode
2. M-x whitespace-mode
   (to be able to tell \t from whitespaces)
3. M-: (setq-local c-ts-mode-indent-offset 8)
4. M-: (setq-local indent-tabs-mode nil)
5. Type something basic to get a nested structure, e.g (`|` indicates a
   cursor position, `.` indicates a whitespace, produces by TAB):
   int
   main()
   {
   ......../*|
   }
6. M-j
7. You should see:
   int
   main()
   {
   ......../*
   .........*|
   }
7.1. It works when we use whitespaces (indent-tabs-mode is nil).
8. M-: (setq-local indent-tabs-mode t)
   (Now use tabs.)
9. Roll back to step 5 (this time tabs will be used instead of
whitespaces; `\t` is a single tab character):
   int
   main()
   {
   \t/*|
   }
10. M-j
11. You should see:
   int
   main()
   {
   \t/*|
   ..*|
   }
11.1. It does not work when we use tabs.