Fix memory_space type_alias in DerivFieldMem. Fixes gyselax#558

[Quntized]

Fix Incorrect memory_space type_alias in DerivFieldMem. It was set to typename base_type::element_type (bug) instead of MemSpace .

This is the same bug as #552 , but in DerivFieldMem instead of DerivField

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[EmilyBourne]

We should have thought to check this file when we merged the last MR 😅

[codecov]

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