Fix utterance theme again

Author: qu1ck

config/_default/params.yaml

@@ -148,7 +148,7 @@ utterances:
   # label: comment
   # By default, light and dark mode correspond to github-light and github-dark, respectively.
   # Optional values: github-light, github-dark, preferred-color-scheme, github-dark-orange, icy-dark, dark-blue, photon-dark.
-  theme: dark
+  # theme:
 
 #staticman:
   #endpoint: https://yourstaticmaninstance # Required, replace with your own Staticman instance.