Failure to parse deferred assertion with final

[saw235]

The following passes

module xyz();
always_comb begin
        z1: assert final (x == y || z);
end
endmodule

but just this fails

module xyz();
        z1: assert final (x == y || z);
endmodule

Even though assertions item is part of the module common item, which covers deferred_immediate_assertion_item Reference : ieee 1800-2017

[zachjs]

Thank you for your fix in #178!