PLCgen test model "expr_unary" does not compile

CIF model: expr_unary.cif

Generated PLC code: DB.db MAIN.scl

Trying to compile the generated code results in multiple errors, which are related to the "DB" expression and missing semicolons. We were unable to identify differences related to "DB" or missing semicolons with other generated PLC codes, so we're unsure why these errors occur specifically in this test.

Addresses #679 Addresses #798 (closed)