fix: do not retrieve remote outbox count when asserting actor

This change means that a remote user's post count is only the number
of posts they have stored locally. This is easier to reconcile with
the profile UI since showing the artificial number could cause issues
if the local instance contains fewer or no posts by that user.

fixes #12646

src/activitypub/mocks.js

@@ -39,7 +39,7 @@ Mocks.profile = async (actors) => {
 		let {
 			url, preferredUsername, published, icon, image,
 			name, summary, followers, followerCount, followingCount,
-			postcount, inbox, endpoints,
+			inbox, endpoints,
 		} = actor;
 		preferredUsername = preferredUsername || slugify(name);
 
@@ -68,7 +68,6 @@ Mocks.profile = async (actors) => {
 			'cover:url': !image || typeof image === 'string' ? image : image.url,
 			'cover:position': '50% 50%',
 			aboutme: summary,
-			postcount,
 			followerCount,
 			followingCount,