Use a single response callback for request field actions
... instead of one for each button.
Testing Done:
Opened Request Fields from Demo and clicked Cancel/OK/Escape. No test for extra actions as I don't think anything currently uses it for Fields.
Reviewed at https://reviews.imfreedom.org/r/2359/
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# INDRANIL DAS GUPTA (ইন্দ্রনীল দাশগুপ্ত) <indradg@l2c2.org>, 2005