Adds WETH to the SLICE configuration in pools.json

[outcassed]

On https://piedaoorg.on.fleek.co/#/slice, the asset name for WETH is currently showing as "undefined".

This change adds WETH to the config pools.json (alongside BCP and PLAY)

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Name	Status	Preview	Comments	Updated (UTC)
pools-piedao-org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2023 6:37pm

[outcassed]

looks good! https://pools-piedao-gs69qd2e0-piedao-testing.vercel.app/#/slice

The eslint thing failed before it even run, not sure what is going on there.

[gbonumore]

thanks for this! LGTM