TreeTable: alignHeader takes no effect

[MBelniak]

Describe the bug

alignHeader prop of columns is not doing anything to the header\s alignment. It's working in DataTable, though.

Reproducer

https://stackblitz.com/edit/vitejs-vite-q1tpes

System Information

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    primereact: ^10.8.1 => 10.8.2 
    react: ^18.3.1 => 18.3.1

Steps to reproduce the behavior

No response

Expected behavior

No response

[MBelniak]

I found out DataTableBase includes a base, non-theme styling, which includes the alignment of a header. TreeTable doesn't have such styling, so the header is styled only when importing some theme.