fix(shielded): log only a completed wallet drain as a succeeded proof

A pending drain was sent but not confirmed, which the other shielded
routes report by throwing and so log as succeeded=false. Logging it as
succeeded mixed unconfirmed drains into the timing comparison.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: PastaPastaPasta

DashWallet/Sources/UI/Payments/InternalTransfer/Shielded/ShieldedTransferCoordinator.swift

@@ -580,7 +580,7 @@ final class ShieldedTransferCoordinator: ObservableObject {
             await env.manager.shieldedFundFromWalletDrain(
                 walletId: env.walletId, operationId: operation.id,
                 recipientRaw43: Self.drainRecipientRaw43(operation.recipient, ownAddress: env.shieldedRecipient))
-        }, succeeded: { $0.drainVerdict != .notSent })
+        }, succeeded: { $0.drainVerdict == .completed })
         if let outpoint = result.outpoint {
             lastAssetLockOutPoint = (outpoint.txidWire, outpoint.vout)
         }