Add form validation to the amount field and test

[Tguntenaar]

I noticed that

• a user was still able to submit negative and huge numbers that would result in a smart contract panic.
• as user could create a payment request with 0 as amount

So I added a small function checking this and wrote a test for it

video.webm

[Tguntenaar]

@race-of-sloths include

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Current status: executed

| Reviewer | Score | |--------|--------| | @petersalomonsen | 5 | Your contribution is much appreciated with a final score of 5! You have received 75 (50 base + 15 weekly bonus + 10 monthly bonus) Sloth points for this contribution Congratulations @Tguntenaar! Your PR was highly scored and you completed another monthly streak! To keep your monthly streak make another pull request next month and get 8+ score for it

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[petersalomonsen]

@race-of-sloths score 5