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

[積丹尼 Dan Jacobson]

If the user enters
```
 24.186781,120.876259
```
instead of
```
24.186781,120.876259
```
into the search box, search can't find it.

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https://github.com/openstreetmap/openstreetmap-website/issues/2384
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