ui/ligatures: fix over-eager activation
ui/ligatures: fix over-eager activation

Users (or packages) may add entries directly to prettify-symbols-alist.
The module would mistaken that as a green light to activate
prettify-symbols-mode. Instead, only activate the mode if this module's
ligatures (or extra symbols) are specifically asked for.

hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d