[Zurich] Fix map on /reports

A seemingly unrelated change in ef6ffbdb was causing JS errors
on the /reports page which meant the map loading spinner
was permanently present. This commit fixes that, and also fixes
another bug which was uncovered where the ?ajax=1 param was
being ignored by the Zürich /reports page, leading to HTML
being returned and another JS error.

The call to `new OpenLayers.Bounds` in
OpenLayers.Strategy.FixMyStreet.getMapBounds was causing
three of the 4 bounds params to be lost when run on OpenLayers
2.11, as this version doesn’t accept an array to the Bounds
constructor. This in turn was using an invalid `bbox` parameter
(only the west value was present) in the AJAX call to /reports
which returned a 500 error. This then crashed the JS and caused
the loading spinner to get stuck.

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