fix: TxFlow submit button alignment, error message spacing

[usame-algan]

What it solves

Part of #2067

How this PR fixes it

• Aligns the submit button to the right at all times
• Adds spacing above error messages

How to test it

1. Open a Safe
2. Confirm an existing transaction
3. Switch to a wallet thats not an owner
4. Observe the Submit button still aligned to the right
5. Create a transaction that will fail
6. Observe enough space above the error message

Screenshots

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

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https://ui_issues--walletweb.review-wallet-web.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[iamacook]

We need to do the same for the SignForm as well.

[iamacook]

Not sure if it's better or worse but if you pass the className to the ErrorMessage components, you need not create the hasError flag. What do you think?

[usame-algan]

Nice, I didn't see that we could already pass a className to ErrorMessage. Lets do it that way so we can remove hasError.