refactor: use negated flags

Ref: 7a806521a92c

modules/checkers/spell/autoload/+spell-fu.el

@@ -1,5 +1,5 @@
 ;;; checkers/spell/autoload/+spell-fu.el -*- lexical-binding: t; -*-
-;;;###if (not (modulep! +flyspell))
+;;;###if (modulep! -flyspell)
 
 (defun +spell--correct (replace poss word orig-pt start end)
   (cond ((eq replace 'ignore)

modules/checkers/spell/config.el

@@ -70,7 +70,7 @@
 ;;
 ;;; Implementations
 
-(eval-if! (not (modulep! +flyspell))
+(eval-if! (modulep! -flyspell)
 
     (use-package! spell-fu
       :when (executable-find "aspell")

modules/checkers/spell/doctor.el

@@ -1,6 +1,6 @@
 ;;; checkers/spell/doctor.el -*- lexical-binding: t; -*-
 
-(when (or (not (modulep! +flyspell))
+(when (or (modulep! -flyspell)
           (modulep! +aspell))
   (unless (executable-find "aspell")
     (warn! "Couldn't find aspell executable; spell checker will not work")))

modules/checkers/spell/packages.el

@@ -1,7 +1,7 @@
 ;; -*- no-byte-compile: t; -*-
 ;;; checkers/spell/packages.el
 
-(if (not (modulep! +flyspell))
+(if (modulep! -flyspell)
     (package! spell-fu
       :recipe (:host github :repo "emacsmirror/spell-fu")
       :pin "e4031935803c66eca2f076dce72b0a6a770d026c")