fix: sometimes changes to the draggable prop don't get propagated

[tagoro9]

This pull request fixes an issue where a change to the draggable prop would not make the map draggable by not omitting the prop inside the shouldComponentUpdate prop.

If we change the prop but there is no other prop change the map behavior won't get updated, as that is done inside the componentDidUpdate function.

You can see the issue reproduced in this sandbox: https://codesandbox.io/s/distracted-wright-hrs51?file=/src/App.js

When you make the map draggable only the last map becomes draggable as there is another prop change, while the first 2 can't be dragged (the second one is expected as the code in componentDidUpdate omits those).

Fixes #978

[IAmBlackHacker]

seems to be working well for me

[tagoro9]

It's still not working for me. Does the sandbox in the PR description work for you?

When I check the draggable checkbox at the top, only the third map becomes draggable, but not the first two. I would expect these 2 to also be draggable.