inductor: maxCurrentRating is dropped from Circuit JSON

[0hmX]

maxCurrentRating is accepted by <inductor /> but is dropped before source Circuit JSON is emitted.

Expected: preserve the accepted value or reject it consistently.
Actual: the value is omitted.

Standalone repro: https://github.com/0hmX/tscircuit-repro-inductor-max-current-ignored

Core repro PR: not yet created.

[rushabhcodes]

fixed