Fix muted text color not applying to all text (#11996)

Pleroma generates polls without p tag

app/javascript/styles/mastodon/components.scss

@@ -1529,6 +1529,7 @@ a.account__display-name {
 }
 
 .muted {
+  .status__content,
   .status__content p,
   .status__content a {
     color: $dark-text-color;