Update UI: Update UI of swap screen to be congurent with figma/iOS

[realpaaao]

Please update the swap screen UI exactly to be congruent with figma.

• [ ] Same as Figma design
• [ ] Open swap screen with two different assets selected
• [ ] without from amount, display 0 in to amount
• [ ] Keep dropdown until #329 implemented

[realpaaao]

includes #345 with more detail

[yvebe]

@realpaaao, don't you think the Figma design is a bit bugged out and has lost all paddings? Current iOS screen seems a bit better I think

[realpaaao]

@yvebe yes definitely! will amend figma edit: amended