don't block private posts to logged in users on the local hub

The recent update to allow logged-in users to see private posts on a profile page marked either as private=1 or private=2 ended up blocked users of the same hub from viewing private content on each other's pages. The lines

```php
	if($local_user) {
		if($local_user == $owner_id) {
			$sql = '';
		}
		else {
			/* logged in user can see hidden walls and feeds that are blocked to unknown users (private == 2) */
			$sql = " AND private != 1 "; 
		}
	}
```

say: if you're logged in locally, and you are not the owner of this profile page, then only show posts that have private != 1, i.e. either 0 or 2. Most private posts are currently set to 1, so this effectively blocks all private posts to a locally-logged in contact. If this section of code is restored to what it was before, then the `private in (1,2)` in the `elseif($remote_contact)` section seems to be sufficient to allow authenticated contacts to see the profile page, whether on a remote hub or the local one.