[BUG] Error when trying to open a database file without extension (no .kdbx) from a WebDAV server

### Checks - [x] I have read the FAQ section, searched the open issues, and still think this is a new bug. ### Describe the bug you encountered: It is not possible to open a database file without extension from a WebDAV server (WebDAV URL is something like https://server.com/dav/db). I am getting an error "Did not find initial path". Adding .kdbx or another extension to the remote file name resolves the issue. Database file name without extension works fine when opened through e.g., dropboxKP2A:// protocol. ### Describe what you expected to happen: The database file should open regardless of whether it has an extension appended to its file name or not. ### What version of Keepass2Android are you using? 1.14-r4 ### Which version of Android are you on? 15