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Verilog: fix constant eval of parameter in replication count (#1487)

A parameter used as a replication count via a `define macro, e.g.
{{`SCALE}{1'b0}}, was parsed as a single-element V_CONCAT wrapping
a V_REF to the parameter.  vlog_get_const and vlog_is_const did not
handle V_CONCAT or V_PARAM_DECL, causing a "expression is not
constant" fatal during lowering.

Add V_CONCAT (single-element, no replication) and V_PARAM_DECL
handling to both functions.

Co-authored-by: Rafał Hibner <rafal.hibner@secom.com.pl>

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