Fix Firefox Timepicker on Create Event

[bledsoef]

Issue Description

Fixes issue #1267

• The create event start and end timepickers are not working on Firefox.

Changes

• Imported flatpickr into the JS file and initialize it for non chrome browsers.
• Attach a new flatpickr object to each datepicker created when a multiple offerings row is added.

Testing

• Checkout development
• Open up CELTS in Firefox
• Verify date selecting does not work
• Checkout 1267-timepicker-issue
• Open up CELTS in Firefox and Chrome
• Make sure you can select dates for a single event on both Firefox and Chrome
• Make the event you are creating a multiple offering event
• Add multiple rows and make sure you can select dates on each of those new rows.

[stevensonmichel]

The time formatting is not quite correct.

[github-actions]

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