[openstreetmap/openstreetmap-website] Strip leading blanks from search string (#2384)

[mmd]

Cannot reproduce here. Even with a dozen leading blanks, I'm still seeing the same search result as before:

![search1](https://user-images.githubusercontent.com/5842757/66255873-0318bf00-e789-11e9-892c-ae3d1465f5a6.png)


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