fix: make both RemoveLessSpecificSeasonEpisode passes execute (#961)

[opensubtitles]

Fixes #961.

Problem

processors.py registers the same rule class twice:

RemoveLessSpecificSeasonEpisode("season"),
RemoveLessSpecificSeasonEpisode("episode"),

but rebulk's Rule.__eq__/__hash__ compare by class only, so when rebulk objects are merged (extend_safe in effective_rules()) the second instance is silently dropped. Only the ("season") pass has ever executed; the ("episode") pass is dead code. Verifiable on 4.4.0:

from guessit.api import default_api
default_api.guessit('warmup.mkv')
rules = [r for r in default_api.rebulk.effective_rules()
         if type(r).__name__ == 'RemoveLessSpecificSeasonEpisode']
len(rules)  # -> 1, and its predicate closes over "season"

Fix

• Registration split into two distinct subclasses, RemoveLessSpecificSeason and RemoveLessSpecificEpisode, so both passes survive dedup.
• Reviving the episode pass exposed one regression in the existing corpus (The.Good.Wife.S06E01.E10.…/The.Good.Wife.S06E09.….mkv — the pack directory's [1, 10] overrode the file's episode 9), so the rule now acts only when one filepart is strictly more SxxExx-specific than the others; equally-specific fileparts fall through to the generic RemoveAmbiguous, whose full-property weight and rightmost preference already pick the correct side.

Same fix shipped in guessit-js (TypeScript port tracking this corpus) where we originally hit the trap.

Tests

Full suite: 2520 passed, 4 skipped (was 1 failure with the naive two-subclass fix, 0 with the specificity guard).