Fix local jump error due to lack of block passing for recording list.

Fixes

It appears after a recent merge that the block passed to the seralize_list method was removed in the recordings file: https://github.com/JYorston/twilio-ruby/commit/1956b94a670527a2886d64ac72a596e84247b4f5

This is causing a local_jump_error when trying to list recordings on the latest Gem version.

I added the block back in and verified that it is now working as expected.

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twilio / twilio-ruby