IBC: Fix "Not enough balance" bugs + use display denom for amounts #3890

Job	Run time
Build Namadillo	4m 13s
Check for yarn.lock poisoning	6s
Build Firefox extension	4m 25s
Build Chrome extension	7m 34s
Lint	58s
JS unit tests	3m 50s
WASM unit tests	5m 45s
E2E tests	0s
	26m 51s

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