fix: calculate transfer fee to get swap routes

[luciorubeens]

Description

Include transaction fees in the input amount when ibc transactions are required prior to swap.

• Fix issues when using the max value.
• Fix steps creation for an asset in a non-native chain.

Fixes: #1820

Thread: https://allinbits.slack.com/archives/C02TBMVAJDN/p1652459008210169

Feature flags

N/A

Testing

See instructions in the thread.

[github-actions[bot]]

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