send with link for large numbers failing

[SustainabilityChain]

when sending a large amount with link (20'000 native) the following error appears:
Error: [number-to-bn] while converting number 2e+22 to BN.js instance, error: invalid number value. Value must be an integer, hex string , BN or BigNumber instance. Note, decimals are not supported

src/app.js:1684

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[yanyishuai]

Claiming #240 — focused fix per bounty scope.

[rovidev95]

Focused fix on
im: #322 — \ oWei(String(amount))\ instead of \�mount*10**18\ for send-with-link. Stacks with rimble-ui series. @TimDaub