fix: use nth-of-type selector

[0xApotheosis]

Description

Use nth-of-type over nth-child selector to "improve SSR" - but that isn't super useful for us.
The main benefit here is to make the annoying console log spew go away by replacing it with a best practice equivalent selector.

Still target the same div:

and toasts still look good (tripled to test rendering):

Issue (if applicable)

QOL

Risk

Low

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

None

Testing

See description.

Engineering

N/A

Operations

N/A

Screenshots (if applicable)

See above.

[NeOMakinG]

Looks good, damn case and SSR