wiretap: have wtap_dump_close() provide a "needs to be reloaded" indication.
This allows the "needs to be reloaded" indication to be set in the close process, as is the case for ERF; having a routine that returns the value of that indication is not useful if it gets seet in the close process, as the handle for the wtap_dumper is no longer valid after wtap_dump_close() finishes. We also get rid of wtap_dump_get_needs_reload(), as callers should get that information via the added argument to wtap_dump_close(). Fixes #17989.pespin/osmux-wip
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