fix: add missing trenstETH pool to stakeable list

[Xeonus]

• voted in with veBAL gauge here: https://forum.balancer.fi/t/bip-644-enable-gauge-for-amphreth-rsteth-re7lrt-steaklrt-wsteth-ethereum/5837

Description

Please include a summary of the change and if relevant which issue is fixed. Please also include relevant motivation and context.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency changes
• Code refactor / cleanup
• Documentation or wording changes
• Other

How should this be tested?

Please provide instructions so we can test. Please also list any relevant details for your test configuration.

• Test A
• Test B

Visual context

Please provide any relevant visual context for UI changes or additions. This could be static screenshots or a loom screencast.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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