Feat: global statusline should still displays for all filetypes, including ignored_filetypes

[lkhphuc]

Requested feature

When global statusline is used, statusline should works for all buffer, including those in disabled_filetypes tables.

Motivation

disabled_filetypes is used to prevent rendering a crammed statusline in overly small windows, this doesn't apply with global statusline.

• One option is just to not disabled any filetypes, but that means winbar (if it is ever officially supported feat: refresh lualine based on timer + winbar support. #736 ) will not ignore some filetypes with small windows either.
• Another option is to have separate options, i.e statusline_disabled_filetypes and winbar_disabled_filetypes (again if it's ever supported)
• Or just ignore ignored_filetypes altogether when using global statusline.

[shadmansaleh]

I think I'll just let users specify which filetypes are to be ignored for winbar. That gives more control to user.