Remove Eglot activation check from find-file-hook

Remove Eglot activation check from find-file-hook

Adding eglot--maybe-activate-editing-mode to find-file-hook isn't
really necessary, since it is already in
'after-change-major-mode-hook', and that also runs every time we find
a file.

This reduces the number of project.el logic that runs every time the
user visits a file.

* lisp/progmodes/eglot.el (find-file-hook): No need to add
eglot--maybe-activate-editing-mode here.