Fix "id is already declared"

[luizademelo]

Currently, the addConstantIDsToParameterList function creates parameters by searching for constant IDs in the program and adding them manually. However, it's possible that these parameters are already explicitly declared in the program:

// Seed: 3489505891
module module_0 #(
    parameter id_12 = 32'd20
) (
    id_1,
    ....
);
...
  localparam id_12 = 1;
...
endmodule

In this case, id_12 is already declared both as a parameter and as a localparam inside the module. The current implementation does not account for such existing declarations.