Fix manual checkpoint in exclusive locking mode.#319
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This pull request modifies the lock acquisition logic in the #pendingCheckpoint method of OPFSWriteAheadVFS.js to conditionally skip acquiring an exclusive write lock. A review comment identifies a concurrency risk where the current check for SQLITE_LOCK_NONE is too broad, potentially allowing checkpoints to proceed without a write lock in normal locking modes. It is suggested to refine the condition to account for the connection's locking mode.
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Fix #318