Test that the minimum share reserves resolve Spearbit's issue

[jalextowle]

Fixes: #425.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: 1c813a5	Previous: 5007450	Deviation	Status
addLiquidity: min	709 gas	709 gas	0%	🟰
addLiquidity: avg	49605 gas	45498 gas	9.0268%	🚨
addLiquidity: max	77728 gas	77728 gas	0%	🟰
checkpoint: min	514 gas	514 gas	0%	🟰
checkpoint: avg	23019 gas	23019 gas	0%	🟰
checkpoint: max	33407 gas	33407 gas	0%	🟰
closeLong: min	659 gas	659 gas	0%	🟰
closeLong: avg	47672 gas	47497 gas	0.3684%	🚨
closeLong: max	83240 gas	83240 gas	0%	🟰
closeShort: min	616 gas	616 gas	0%	🟰
closeShort: avg	42742 gas	42330 gas	0.9733%	🚨
closeShort: max	84477 gas	84477 gas	0%	🟰
initialize: min	532 gas	532 gas	0%	🟰
initialize: avg	160360 gas	160281 gas	0.0493%	🚨
initialize: max	161781 gas	161781 gas	0%	🟰
openLong: min	661 gas	661 gas	0%	🟰
openLong: avg	115861 gas	114770 gas	0.9506%	🚨
openLong: max	175911 gas	175911 gas	0%	🟰
openShort: min	709 gas	709 gas	0%	🟰
openShort: avg	158997 gas	159830 gas	-0.5212%	✅
openShort: max	218810 gas	218810 gas	0%	🟰
removeLiquidity: min	569 gas	569 gas	0%	🟰
removeLiquidity: avg	62394 gas	62682 gas	-0.4595%	✅
removeLiquidity: max	116558 gas	116558 gas	0%	🟰

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

[coveralls]

coverage: 96.372%. remained the same when pulling 1c813a5 on jalextowle/test/lp-with-small-share-reserves into 5007450 on main.

[ControlCplusControlV]

LGTM, just a minor comment about a magic number