Changes to add friends popup

[wesleypayton]

Problem

We want an X button on the Add Friends popup to match style with our other popups.
We also want to add a hashtag graphic before the email entry for styling.

Definition of Done

• Add Friends popup has an X button at the top right corner that closes the popup
• The email entry has a hashtag icon before it

Solution

• Converted Add Friends popup to use Grid layout rather than VerticalStackLayout
• Added X button that closes the popup similar in style to the mindfulness tip popup
• Add Friends popup can only be closed using the X button
• Added hashtag icon before the email entry
• Changed text on send button to be circle arrow icon to conserve space

How was this tested?

Manually tested on android emulator. Needs to be tested on android test device.

[ChrispyPeaches]

LGTM!

[iggy808]

ggwp