Hotfix: Allow staking of Avalanche FX pool

[timjrobinson]

Description

Currently there is no way to stake tokens for the Avalanche FX pool (0x55bec22f8f6c69137ceaf284d9b441db1b9bfedc000200000000000000000011) via the UI because of two reasons:

• The staking card is currently hidden when it is a custom pool type that has a custom way of adding liquidity (FX/Gyro)
• The pool wasn't in the staking approve list, which made the stake button not appear in the porfolio page.

This fixes both those issues.

I did notice the Gyro pools aren't on the staking lists, should they be so that users can stake their LBP through the Balancer UI?

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Ensure the add liquidity and stake cards appear as normal on normal pools (e.g. /#/avalanche/pool/0x054e7b0c73e1ee5aed6864fa511658fc2b54bcaa000000000000000000000015)
• Ensure the stake card doesn't appear on a pool without staking (e.g. /#/avalanche/pool/0x3396cca90c9335565ecdbae3a260dafb13a7959e000200000000000000000018)
• Ensure the custom card + staking appears on a custom pool (e.g. /#/avalanche/pool/0x55bec22f8f6c69137ceaf284d9b441db1b9bfedc000200000000000000000011)
• Ensure no cards appear on LBP pools (e.g. /#/ethereum/pool/0x84d9288a62132b9e9097aaefd2caea7d5ce966c50002000000000000000005ac)

Visual context

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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