Fix erroneous validation error

[smithellis]

Description of Fix for PR

Issue: When initially visiting the edit_avatar view, a field validation error about the avatar field being required is shown, even though the form has not been submitted.

Fix: The issue was caused by the form being instantiated with request.FILES even on a GET request, which triggered the validation logic prematurely. The fix involves modifying the edit_avatar view to ensure that the form is only instantiated with request.POST and request.FILES when the request method is POST.

Changes Made:

1. Updated the edit_avatar view to check the request method. If the request method is POST, the form is instantiated with request.POST and request.FILES. If the request method is GET, the form is instantiated without request.POST and request.FILES.
2. Ensured that the form validation logic is only triggered when the form is actually submitted (POST request).