chore: remove redundant isDisabled prop

[anusha-c18]

Summary

The Home component uses the useAccounts() hook to get the isLoading value, which it then passes to HomeActions via the isDisabled prop. In HomeActions, this value is used to conditionally disable the Send and QR code buttons:

• Send button: isDisabled={isLoading || isDisabled || !hasBalance}
• QR button: isDisabled={isDisabled}

However, since HomeActions already uses the useAccounts() hook and has direct access to isLoading, the prop is redundant. This PR removes the prop and simplifies the disabled conditions.

Checklist

• I've added error handling for all actions/requests, and verified how this error will show on UI. (or there was no error handling)
• I've reviewed all the copy changed/added in this PR, using AI if needed. (or there was no copy changes)
• I've included the reference to the issues being closed from Github and/or Linear (or there was no issues)
• I've changed the Docs to reflect my changes (or it was not needed)
• I've put docs links where it may be helpful (or it was not needed)
• I checked the resulting UI both in Light and Dark mode (or no UI changes were made)
• I reviewed the entire PR myself (preferably, on GH UI)

[fuel-cla-bot]

Thanks for the contribution! Before we can merge this, we need @anusha-c18 to sign the Fuel Labs Contributor License Agreement.