mod_storage_xmlarchive: Remove unnecessary percent-encoding of paths Paths from lfs.dir() are already in the percent-encoded form. Probably confusion left over since before 1b081c8fc1d9

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```