Compatibility with JetPack Lazy Load Images

[kimcoleman]

Describe the bug
When a site is using JetPack to Lazy Load images, the map does not consistently render.

To Reproduce
Activate Membership Maps and JetPack. Ensure the Lazy Load Images feature is enabled.

1. View your map as a non-member / visitor
2. The map inconsistently renders.

JetPack has a filter you can use to set an array of CSS class selectors that SHOULD NOT be lazy loaded. We should test and figure out the best selector to use here (it may be the map container

or we may need to narrow in on the CSS selector that gets rendered by Google Maps API).

See: https://developer.jetpack.com/hooks/jetpack_lazy_images_blocked_classes/ and https://jetpack.com/support/lazy-images/