Fix check for verilog parameters

[antonblanchard]

bigspicy always prints a warning that verilog modules have parameters,
even if they don't.

With this patch we correctly print the warning when there are parameters:

cat << EOF > test1.v
module test1 #(
    parameter FOO = 1
);
endmodule
EOF
./bigspicy.py --import --verilog test1.v --top test1

And don't print the warning when there are no parameters:

cat << EOF > test2.v
module test2 (
);
endmodule
EOF
./bigspicy.py --import --verilog test2.v --top test2

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[antonblanchard]

Looking into the CLA issue

[growly]

Thans Anton. Are you able/willing to sign the CLA? If not I can make the same patch.