fixed test around slippage #349

Job	Run time
1155 Contracts / build / Build	36s
1155 Contracts / coverage / Coverage	1m 21s
1155 Deployments / build / Build	3m 48s
ERC20Z Contracts / build / Build	30s
ERC20Z Contracts / coverage / Coverage	2m 49s
Protocol Rewards / build / Build	25s
Protocol Rewards / coverage / Coverage	2m 18s
Sparks / build / Build	25s
Sparks / coverage / Coverage	59s
Sparks Deployments / build / Build	25s
Sparks / storage_layout	0s
Sparks / contract_sizes / Contract sizes	32s
Sparks / slither / Slither	50s
Sparks / test / Test	38s
Protocol Rewards / storage_layout	0s
Protocol Rewards / test / Test	56s
Protocol Rewards / contract_sizes / Contract sizes	36s
Protocol Rewards / slither / Slither	37s
Sparks Deployments / test / Test	35s
ERC20Z Contracts / contract_sizes / Contract sizes	35s
ERC20Z Contracts / slither / Slither	56s
ERC20Z Contracts / storage_layout / Storage layout inspection	32s
ERC20Z Contracts / test / Test	1m 28s
1155 Contracts / slither / Slither	1m 18s
1155 Contracts / contract_sizes / Contract sizes	34s
1155 Contracts / storage_layout / Storage layout inspection	36s
1155 Contracts / test / Test	36s
1155 Deployments / test / Test	4m 45s
	29m 40s

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