Fix flutter web crash

[ethanwlee]

Currently, running didpay using flutter web results in the following error:

Rejecting promise with error: TypeError: Cannot set properties of undefined (setting 'nativeCommunication')

Fix the error by adding the flutter_inappwebview_web package and editing web/index.html (hint: follow the thread here pichillilorenzo/flutter_inappwebview#1468)

[victoreronmosele]

.take

[github-actions]

Thanks for taking this issue! Let us know if you have any questions!

[victoreronmosele]

@ethan-tbd, the crash no longer occurs after your recent PR.

The web app now loads without a crash.

[ethanwlee]

@victoreronmosele you're right, looks like the error detailed in this issue was fixed by updating flutter_inappwebview here. will close out this issue