DEV: Minor improvements to WordWatcher (#16735)

Follow-up to fd1dc91eed

app/services/word_watcher.rb

@@ -7,17 +7,14 @@ class WordWatcher
     @raw = raw
   end
 
+  @cache_enabled = true
+
   def self.disable_cache
-    @disabled = true
+    @cache_enabled = false
   end
 
-  def self.enable_cache
-    @disabled = false
-  end
-
-  # Don't cache in tests mode
-  def self.cache_disabled?
-    @disabled
+  def self.cache_enabled?
+    @cache_enabled
   end
 
   def self.words_for_action(action)
@@ -37,12 +34,12 @@ class WordWatcher
   end
 
   def self.get_cached_words(action)
-    if cache_disabled?
-      words_for_action(action).presence
-    else
+    if cache_enabled?
       Discourse.cache.fetch(word_matcher_regexp_key(action), expires_in: 1.day) do
         words_for_action(action).presence
       end
+    else
+      words_for_action(action).presence
     end
   end