revert(161348330): 恢复被破坏的“深国交护城河”

As a SCIE student, I can confirm there is definitely an artificial stream around the campus. 

While the name "深国交护城河" might not be the formal name of this stream, the path is correct and shouldn't be removed. 

In my opinion, contributions to OSM are iterative and open to refinements. In this situation, naming imperfections are acceptable and expected to be refine in the future. Suggestions and contributions are always welcome.