vim:setts: Change 'tabstop' to 8

I got used to code that is indented with (meant) tabs of width 8.

.config/vim/vimrc.d/30-settings.vim

@@ -22,7 +22,7 @@ set timeoutlen=1000 ttimeoutlen=0
 " smart case insensitive search (insens: /copy /Copy\c; sens: /Copy /copy\C)
 set ignorecase smartcase
 " Tab size
-set tabstop=4
+set tabstop=8
 " Shift the same amount as tabstop
 set shiftwidth=0
 " Control how vim formats paragraphs. See :h fo-table