Fix issue of update more than one custom property

[roboticsexpert]

as you see request attribute is overriding in first loop iteration and in second iteration it has wrong value that cause to just update first custom property field

[cv-chameleon]

@ebess can you merge this pull request please?

[roboticsexpert]

@cv-chameleon I really don't remember, how these lines of changes, fix the problem now, but it has worked for me and fixed the problem . you can use this instead if you are in hurry

composer require roboticsexpert/advanced-nova-media-library

[cv-chameleon]

Thank you @roboticsexpert , in the meantime I already switched to this fork https://github.com/marshmallow-packages/advanced-nova-media-library