Add SHU token on Ethereum mainnet

[cheeky-gorilla]

Adds the Shutter token (SHU, 0xe485e2f1bab389c08721b291f6b59780fec83fd7) on Ethereum mainnet.

[cursor]

PR Summary

Low Risk
Single-row addition to a static token mapping; low risk aside from potential incorrect address/decimals causing bad pricing for this token.

Overview
Adds the Shutter token (SHU, 0xe485e2f1bab389c08721b291f6b59780fec83fd7, 18 decimals) to the static Ethereum token list used for pricing (prices_ethereum_tokens.sql).

^{Written by Cursor Bugbot for commit 52ff9d8. Configure here.}