(Reuters) -Cenovus Energy Inc will buy the remaining 50% stake it does not already own in Ohio-based BP-Husky Toledo Refinery for $300 million from British energy firm BP PLC, the Canadian company said on Monday. The deal marks a continuation of BP’s reshaping of its North American oil and gas operations, as it tries to cut its greenhouse gas emissions to appease investors. Cenovus in June bought out BP’s 50% interest in the Sunrise oil sands, where it was already the operator. Cenovus said the Toledo refinery recently completed a major, once in five years turnaround, and the deal will bring c…