UI Update: `My Assets` number rules

[ayikfour]

Proposal:

Case: if value < 1:
show maximal 6 digits behind period.
ex: 0.234345 ETHRISE

Case: if value > 1:
show only 2 digits behind period.
ex: $2.23

Example:

Figma Link:
https://www.figma.com/file/t4BnIO0LHqk10vmKZ4kRV4/Website-%E2%80%93-1.0?node-id=1710%3A103985