Rework buttons on meeting select page, /secr/meetings

`owner:rcross@amsl.com` `resolution_fixed` `type_defect`   |    by rcross@amsl.com

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It's too easy to click "Create new meeting" when you intended to select an existing meeting

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_Issue migrated from trac:2629 at 2022-03-04 07:03:09 +0000_