Price Field Form: save the fid for the postProcess hook

[mlutfy]

Overview

When customizing the Price Field form (i.e. new Price set -> new price field), extensions implementing the postProcess hook cannot handle new fields, since the fid is not set in the form.

This is only visible when adding a new price field, not when editing an existing field.

Before/After

With this PR, extensions can do extra processing in a postProcess (ex: handle a field that was added to the interface).

Comments

Related PRs: #17516 , #17514

[civibot]

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[eileenmcnaughton]

@mlutfy Can you add a comment noting this makes it available to the hooks?

[mlutfy]

Good point, done :)