Fix wrong color for ellipsis in boost confirmation dialog in Web UI (#13355)

app/javascript/styles/mastodon/components.scss

@@ -1028,13 +1028,11 @@
     }
 
     .display-name {
+      color: $light-text-color;
+
       strong {
         color: $inverted-text-color;
       }
-
-      span {
-        color: $light-text-color;
-      }
     }
 
     .status__content {