Change font size of announcements to be the same as statuses (#12949)

app/javascript/styles/mastodon/components.scss

@@ -6654,6 +6654,10 @@ noscript {
     padding: 15px;
     padding-right: 15px + 18px;
     position: relative;
+    font-size: 15px;
+    line-height: 20px;
+    word-wrap: break-word;
+    font-weight: 400;
 
     &__range {
       display: block;