ui test for tapping the reply icon

[tomholub]

This is asking for a UI test as well as follows:

1. open any conversation
2. tap the reply icon
3. verify that you are on reply screen, and verify the information that was prefilled:
   • to: (contain email address of the person who sent the message you were viewing earlier)
   • quoted message content

will file another issue.

Originally posted by @tomholub in #936 (comment)

[tomholub]

Not actionable until #936 fixed