Blur profile image when user account disabled

Summary:
Add blur and sepia filter to disabled user profile image.

Before this change, the image was just greyed out but still fully recognizable.

Closes T15515

Test Plan:

• Create an account with a custom profile picture
• Disable the account
• Go to user profile of the account
• Go to a task with activity of that account and hover over the account to open card view

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15515

Differential Revision: https://we.phorge.it/D25322