Revert "feat(async): use is_async_compatible() to determine backend…

… incompatibility and error out (#1355)"

This reverts commit c3e2557.

src/commands/webdav.rs

@@ -84,11 +84,6 @@ impl WebDavCmd {
     fn inner_run(&self, repo: CliIndexedRepo) -> Result<()> {
         let config = RUSTIC_APP.config();
 
-        // webdav only works with async compatible repo
-        if !repo.is_async_compatible() {
-            return Err(anyhow!("Webdav is currently incompatible with the backend you are using. See https://github.com/rustic-rs/rustic/issues/1181 for more details."));
-        }
-
         let path_template = config
             .webdav
             .path_template