fix: switch to b64veryfast:decode64_url/1

[charmful0x]

about

discovered this while trying to use rebar3 device publish -- debugged more and found that signed ans104 are failing the item_verify check. this led to b64veryfast URL decode usage in hb_util:decode/1. the unchecked decoder dont preserve roundtrip correctness for larger unpadded values such as RSA owners/signatures which breaks ans104 commitment verification

repro

anything that does hb_util:decode/1 is broken on edge, for example dev_ans104.erl
rebar3 device test --module dev_ans104

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  Failed: 14.  Skipped: 0.  Passed: 10.
===> device test failed: eunit_failed

on this branch fix it is back to 100% success

=======================================================
  All 24 tests passed.