Fixed: notification issues in bopis (#274)

[amansinghbais]

Related Issues

Related Issue: #274

Short Description and Why It's Useful

Fixed following issue:

• Notification preferences not updating on facility change.
• Improved logic to update notification specific to user.
• Implemented loader on notificaiton preference update action.

Remaining issue:
Currently when user login to app, the notifications works fine. But once user refreshes the app post login. The firebase initialisation logic written in dxp-components doesn't work resulting in following issues:

• Notifications not coming up when user is in app.
• Notifications are not added to notifications tab of the app on opening on click of background alert notification.

Probable reason: Firebase initialisation is written in dxp-component which is called on login but when app refreshes that inititialisation reference gets lost and events for notification listening on dxp-component doesn't work.

Screenshots of Visual Changes before/after (If There Are Any)

Contribution and Currently Important Rules Acceptance

• I read and followed contribution rules