Fix TX amount calculation in trade manager

[Quexington]

#16842

[coveralls-official]

Pull Request Test Coverage Report for Build 7021690610

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• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• 65 unchanged lines in 11 files lost coverage.
• Overall coverage decreased (-0.04%) to 90.254%

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Files with Coverage Reduction	New Missed Lines	%
chia/rpc/wallet_rpc_api.py	1	88.06%
chia/simulator/setup_nodes.py	1	98.31%
chia/rpc/rpc_server.py	2	88.01%
chia/timelord/timelord.py	2	73.67%
chia/consensus/block_creation.py	5	80.17%
chia/server/address_manager.py	5	90.36%
tests/core/util/test_lockfile.py	5	88.66%
chia/daemon/server.py	7	86.48%
chia/full_node/full_node.py	7	84.28%
chia/server/node_discovery.py	8	78.18%

Totals
Change from base Build 7007825064:	-0.04%
Covered Lines:	93545
Relevant Lines:	103587

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💛 - Coveralls

[aqk]

This looks great. You should add a test that fails in main and passes on this branch.

[wjblanke]

aok