Remove RescoreMovesViaSearch's dead same-ply recursive pre-call.

Before searching its own move list, RescoreMovesViaSearch called itself
recursively at an even shallower depth, at the *same* ctx->uPly, on the
theory that the extra rescore's side effects (hash/killer/history table
population) would help the real loop's own -Search() calls find cutoffs
faster. But the recursive call's own iValue writes were always fully
overwritten by this same call's loop immediately after it (same ply,
same move-stack range), so the only way it could possibly help was via
those side effects.

Measured directly: disabling it produced a bit-identical result across
all three test suites (ecm_ringers.ep_, ecm_confident_quick.ep_,
ecm_hard_quick.ep_ at sn=5M) -- no change whatsoever, not even a single
position. It was pure wasted search effort. Removed.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01YGSMkwjqiCk4XhbfN7ugD2

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