Imported tokens table sorting

[mstrasinskis]

Motivation

Important tokens should be displayed together with SNS tokens that have a balance (between the important ck-tokens with a balance and ck-tokens without a balance). All tokens should be sorted alphabetically.

Changes

• Replace compareTokensWithBalanceFirst with compareTokensWithBalanceOrImportedFirst comparator.
• Provide imported tokens id to the token table sorting function.

Tests

• Unit tests were updated.

Todos

• [ ] Add entry to changelog (if necessary). Not yet.