Fix RequestBody compilation error in WebDAV PROPFIND request

- Fix RequestBody.create() parameter order for OkHttp API compatibility
- Pass RequestBody directly to method() instead of using .body() on null-body requests
- Resolves compilation error: cannot find symbol .body()
- WebDAV PROPFIND now properly sends XML body for file existence checks

Author: linuxhenhao

src/java/JavaFileStorage/app/src/main/java/keepass2android/javafilestorage/WebDavStorage.java

@@ -313,15 +313,15 @@ private boolean fileExists(ConnectionInfo ci) throws Exception {
         try {
             Request request = new Request.Builder()
                     .url(new URL(ci.URL))
-                    .method("PROPFIND", null)
-                    .header("Depth", "0")
-                    .header("Content-Type", "application/xml")
-                    .body(RequestBody.create("<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
+                    .method("PROPFIND", RequestBody.create(MediaType.parse("application/xml"),
+                            "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
                             "<D:propfind xmlns:D=\"DAV:\">\n" +
                             "    <D:prop>\n" +
                             "        <D:resourcetype/>\n" +
                             "    </D:prop>\n" +
-                            "</D:propfind>", MediaType.parse("application/xml")))
+                            "</D:propfind>"))
+                    .header("Depth", "0")
+                    .header("Content-Type", "application/xml")
                     .build();
 
             Response response = getClient(ci).newCall(request).execute();