🔧 Remove fish files from .EditorConfig

Using tabset nvim plugin instead to manage file-specific tab width, as
this is global rather than having to be set per project.

projects/.EditorConfig

@@ -5,6 +5,3 @@ indent_style = space
 indent_size = 2
 trim_trailing_whitespace = true
 max_line_length = 80
-
-[*.fish]
-indent_size = 4