Sending assets small improvement suggestions

[DalderupMaurice]

Expected Behavior

• [ ] When sending assets, the amount field is not cleared
• [ ] When sending GAS or include a fee, cut trailing zero's
• [ ] Validate if amount is not 0 ?
• [ ] You're able to enter E and e inside the amount field

Current Behavior

All the opposites :P

Steps to Reproduce

1. Send assets and observe

Possible Solution

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Additional context

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Your Environment

• nOS Client version used: 0.4.0
• Environment name and version
  • Node version: lts
  • NPM version: lts
  • Yarn version: lts
• Operating System and version (desktop or mobile):