Fixes import_into using the previous environment's __newindex if set #395
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This seems like a typo; gmt.__index is always overridden below, so this currently would do nothing, and we wouldn't want to use another table's __newindex as this table's __index.
gmt does sometimes have its own __newindex set below, but AFAICT the case where it's set is mutually exclusive with this case. (__newindex is only set if mod is truthy; mod is truthy if env is originally true, in which case it is set to an empty table; prevenvmt is env's metatable, so not set in that case.)