[openstreetmap/openstreetmap-website] geo URIs: separate z parameter with a semicolon, not question mark (Issue #5322)

[Slaven Rezić]

### URL

_No response_

### How to reproduce the issue?

It seems that additional parameters in a geo URI should be separated by semicolons, not by a question mark.
Currently the share functionality on the openstreetmap website is producing geo URIs like this:
```
geo:52.51626,13.37787?z=15
```
However, all documentation about geo URIs I found (https://en.wikipedia.org/wiki/Geo_URI_scheme, https://www.rfc-editor.org/rfc/rfc5870.txt) use only semicolons. Also
I found a software (a geolink extension for emacs org-mode) which also thinks it should be semicolons:
https://github.com/misohena/org-geolink/blob/main/org-geolink.el#L31-L33

So should the share functionality generate the above as
```
geo:52.51626,13.37787;z=15
```
?


### Screenshot(s) or anything else?

_No response_

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