[Search Map] Enable preserve a specified URL zoom parameter on page load

[DieBatzen]

Enables #2545 after GS tech update.

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@DieBatzen
Moin,
great that you're continuing to work on the search map.
I've opened the new issue #2708 where we can coordinate the work on the search map. Please send a short message there in the future if you take on any of the work so that we don't do anything twice.
I've registered you there for the function setZoom.

[DieBatzen]

As usual, an unexpected issue showed up. :(
This time, FF behaves slightly different than Chrome. Even worse, one day before it didn't - at least it wasn't observable ...
Long story short, now the code works in both, FF and Chrome.

PR is now ready for merge.

[DieBatzen]

@DieBatzen Moin, great that you're continuing to work on the search map. I've opened the new issue #2708 where we can coordinate the work on the search map. Please send a short message there in the future if you take on any of the work so that we don't do anything twice. I've registered you there for the function setZoom.

Good idea.
I'll add a comment there if and before I'm taking over a task.
And hopefully we didn't overlap on this task here ...

By the way, assignment for setZoom got somehow swapped with scrollInCacheList.

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@DieBatzen
Moin,
I haven't tested yet.
I can't really reproduce it right now. Maybe I just don't understand what it's about. For example, if I select the Search geocaches button on the Browse Map, I get to the Search Map. There the zoom parameter is always set to 11, regardless of what was previously passed on via the url. From my point of view, the passed zoom parameter is ignored, but is not set to 14 but to 11.

Maybe we should continue to only execute unsafeWindow.MapSettings.Map.setZoom(zoom); if a zoom parameter was passed.

In the current version it said

if (zoom !== 14) {
    unsafeWindow.MapSettings.Map.setZoom(zoom);
}