Only look up whether a module's SOURCE-imported if it's in the current package
Suppose we import anotherPackage:M, which exports things from anotherPackage:Internal. Then GHC will want to read anotherPackage:Internal.hi. However, if we have also SOURCE-imported thisPackage:Internal then we don't want GHC to try to read anotherPackage:Internal.hi-boot instead. The mapping that tells us whether a module is SOURCE-imported uses just the module name for the key, so we have to check the package ID before looking it up. Fixes #3007.
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