Receive and Send screen: currency selection

[dariatarakanova]

Please work only on points mentioned in this task. Design for Send and receive screens will be changed later in another task.

1)Dropdown coin's list on receive screen. https://zpl.io/bleZxPP

2) Arrow position when list is closed

2.1) Arrow position when list is open

3) Same flow for Send screen https://zpl.io/a7p5M3W

[AndreyDyakonov]

If we click arrow near "BEAM" then instead of a drop-down coin's list opened new window with available coins

[AndreyDyakonov]

Checked