Fix loading of profile fields on additional participant form

[jitendrapurohit]

Overview

Profile fields missing from the Additional participant page.

Before

No fields are loaded on the additional participant form. If Continue button is pressed, it returns an error as displayed below -

After

Profile is loaded correctly.

Technical Details

Kept the required bits from #15515

Comments

5.19 rc is unaffected by this problem. ping @eileenmcnaughton @colemanw

[civibot]

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[eileenmcnaughton]

Thanks @jitendrapurohit