NFC: Update lit.cfg to specify -parse-as-library for module interface tests #67838
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Tests that use the
%target-swift-emit-module-interface
lit substitution are designed to test the behavior of the compiler when emitting module interfaces for resilient libraries. It therefore makes sense to pass-parse-as-library
by default for these frontend invocations.Fixes a few tests that were accidentally depending on parsing source files as top level code.