Fixes presignup'ing

[itsjoekent]

What's this PR do?

Uses a different query for presignups

How should this be manually tested?

Does going to a closed campaign page / clicking presignup button work?

Any background context you want to provide?

starting with this comment (and everything after I wrote) #6070 (comment)

What are the relevant tickets?

Fixes #6070

[sergiitk]

First, you need to check if (!is_null($result)), as execute method may return NULL.

[sergiitk]

Also, you don't need to pass 0 as an argument, it's default value.

[itsjoekent]

@sergii-tkachenko fixed!

[itsjoekent]

@sergii-tkachenko alright, now its good haha

[sergiitk]

Also, @return statement in the docblock should say int|false, not mixed.

[itsjoekent]

@sergii-tkachenko hows that?

[sergiitk]

👍