Fix check permissions in civicrm_api call

[peetCreative]

Overview

I found that with my setup searching for existing contacts by city did not work.
After fideling around I found that checkpermissions was not set FALSE before calling the civicrm_api4.

Technical Details

This was due to the behaviour of += for php arrays, which won't overwrite existing elements.
As the element $params['checkPermissions'] was set true earlier, the element was not overwritten by += and so the explicit join did not work.

I added a quick fix, setting the element in the common way. Also one other function.

Comments

However I found, that the extension is using += quit often. But I wonder if there is a need for it?

[KarinG]

5.79 RC build crashed but not due to this PR. Merging (tests will run again on merge).

[KarinG]

Thanks for this too 👍