Escape spaces in RewriteRule (due to CVE-2023-25690 and Apache httpd error AH10411)

[Lantizia]

Without this, on a modern version of Apache httpd (or one which has had security fixes backported like in Debian) you'll get this in your Apache httpd error log...

[rewrite:error] [pid 29981:tid 1] [client 0.0.0.0:58698] AH10411: Rewritten query string contains control characters or spaces

So you don't get to see any photos that have a space in the filename without this, either the main image or thumbnails.