Fix type for Lovefield RawForeignKeySpec object
Fix type for Lovefield RawForeignKeySpec object

Currently the RawForeignKeySpec.timing type is set to lf.ConstraintAction. After checking the test in https://github.com/google/lovefield/blob/master/tests/schema/builder_test.js#L49 I confirmed that it should be lf.ConstraintTiming instead.

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