Revert "Fix undefined block (#4471)" (#4472)

This reverts commit 7cac413f3b.

src/view/com/posts/FeedItem.tsx

@@ -196,12 +196,6 @@ let FeedItemInner = ({
     },
   ]
 
-  const isParentBlocked = Boolean(
-    parentAuthor?.viewer?.blockedBy ||
-      parentAuthor?.viewer?.blocking ||
-      parentAuthor?.viewer?.blockingByList,
-  )
-
   return (
     <Link
       testID={`feedItem-by-${post.author.handle}`}
@@ -326,16 +320,7 @@ let FeedItemInner = ({
             onOpenAuthor={onOpenAuthor}
           />
           {!isThreadChild && showReplyTo && parentAuthor && (
-            <ReplyToLabel
-              profile={
-                isParentBlocked
-                  ? {
-                      ...parentAuthor,
-                      displayName: _(msg`a blocked user`),
-                    }
-                  : parentAuthor
-              }
-            />
+            <ReplyToLabel profile={parentAuthor} />
           )}
           <LabelsOnMyPost post={post} />
           <PostContent