remove outdated call to updateLiquidity in open long path

[jrhea]

update liquidity is always being called with 0 and that code path should be removed

This change should have been included in #218

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: f95ca49	Previous: 2c57aa3	Deviation	Status
addLiquidity: min	687 gas	687 gas	0%	🟰
addLiquidity: avg	49285 gas	47756 gas	3.2017%	🚨
addLiquidity: max	83536 gas	83536 gas	0%	🟰
checkpoint: min	514 gas	514 gas	0%	🟰
checkpoint: avg	23022 gas	23022 gas	0%	🟰
checkpoint: max	33418 gas	33418 gas	0%	🟰
closeLong: min	659 gas	659 gas	0%	🟰
closeLong: avg	46419 gas	46800 gas	-0.8141%	✅
closeLong: max	81328 gas	81328 gas	0%	🟰
closeShort: min	616 gas	616 gas	0%	🟰
closeShort: avg	40926 gas	40838 gas	0.2155%	🚨
closeShort: max	81627 gas	81627 gas	0%	🟰
initialize: min	687 gas	687 gas	0%	🟰
initialize: avg	139493 gas	139493 gas	0%	🟰
initialize: max	140690 gas	140690 gas	0%	🟰
openLong: min	661 gas	661 gas	0%	🟰
openLong: avg	104653 gas	102114 gas	2.4864%	🚨
openLong: max	148215 gas	148646 gas	-0.2900%	✅
openShort: min	687 gas	687 gas	0%	🟰
openShort: avg	138079 gas	142570 gas	-3.1500%	✅
openShort: max	207735 gas	207735 gas	0%	🟰
removeLiquidity: min	547 gas	547 gas	0%	🟰
removeLiquidity: avg	60417 gas	59973 gas	0.7403%	🚨
removeLiquidity: max	116344 gas	116344 gas	0%	🟰

This comment was automatically generated by workflow using github-action-benchmark.

[coveralls]

coverage: 96.998% (-0.003%) from 97.001% when pulling f95ca49 on remove-update-liquidity-call into 2c57aa3 on main.