Correctly set popover position in geographic example

[MoonE]

Fixes #13029

Popover is only initialized once, calling popover again does not change the content unless the popover was disposed.
Not necessary for this example as there is only one feature, but feels like a good idea to have it anyways.

[github-actions]

📦 Preview the examples and docs from this branch here: https://deploy-preview-13030--ol-site.netlify.app/.

[jipexu]

Thanks
what do you think for the longitude values ?

[MoonE]

I think it makes sense to not keep the center longitude to the range of [ -180, 180 ).
The example shows how to work with geographic coordinates in OpenLayers and coordinates won't wrap automatically, so I think it makes sense to display it this way.

[jipexu]

Ok but for me it is not comprehensible and quite confusing that a longitude can display such results in a geographic application... A visitor playing with the example will say at first glance that something is wrong ... It is not the correctness or logic of the code that causes me the problem but what is shown in this example...

[MoonE]

I understand you concerns from a user's point of view, but these are the values provided by OpenLayers for developers.