NERDCommenterDelims left switches to leftAlt repeatedly on a new .c buffer open

[Konstantin-Glukhov]

How to reproduce:

1. Open a .c file and trigger NERDCommenterComment on one line
2. In the same session open a new window/tab with another .c file and trigger NERDCommenterComment
3. Observe that the comment switched from left to leftAlt
4. Keep repeating prior 3 steps with different files

Vim 9.0.1607 MS-Windows 64-bit GUI version with OLE support
Vim 8.2.5171 MS-Windows 64-bit GUI version with OLE support