Adding email prefill if query string value is present

[michal-franc]

To improve the registration conversion all the users receiving an invitation to register should get a link that contains a query string with their email used to prefill the form with their email address so that they don't have to fill it in.

Where should the reviewer start?

This is a small change so just check the changed code.

How has this been tested?

Scenarios tested:

• email is present in the query string

?email=test@test.com

• email not present in the query string
• email encoded

?email=test%40test.com

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)