Fix python wide-number assert on 11.4.14.3--unpack_stream_pad-sim.sv

[wsnyder]

Fix 11.4.14.3--unpack_stream_pad-sim. Although there is some support for wide numbers, the assert here was miscalculated in the test driver, so moving the check into Verilog.

[github-actions[bot]]

Changes In Tests

Tool	New Failures	New Passes	Added	Removed	Not Affected
sv_parser	0	0	0	0	5011
Slang	0	0	0	0	5074
Odin	0	0	0	0	5011
Surelog	0	0	0	0	5074
moore	0	0	0	0	5011
circt_verilog	0	0	0	0	5073
tree_sitter_systemverilog	3	13	0	0	4901
SynligYosys	0	1	0	0	4731
Sv2v_zachjs	0	0	0	0	5074
Icarus	0	0	0	0	5079
yosys_slang	0	0	0	0	4270
tree_sitter_verilog	0	0	0	0	4920
Slang_parse	0	0	0	0	5011
Verible	0	0	0	0	4920
Yosys	1	0	0	0	4732
moore_parse	0	0	0	0	4920
VeribleExtractor	0	0	0	0	4920
Verilator	0	1	0	0	5078

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[wsnyder]

@kbieganski should be good to merge, thanks.