Fix color contrast in report modal (#33468)

app/javascript/styles/mastodon/components.scss

@@ -1590,7 +1590,7 @@ body > [data-popper-placement] {
   padding: 0 10px;
 
   .detailed-status__display-name {
-    color: lighten($inverted-text-color, 16%);
+    color: $dark-text-color;
 
     span {
       display: inline;