Adapt acme account key to Debian 10

src/symbols/acme/account_key.rs

@@ -46,7 +46,7 @@ impl<P: AsRef<Path>, C: CommandRunner> Symbol for AcmeAccountKey<'_, P, C> {
         "-text",
       ],
     )?;
-    Ok(stdout.starts_with(format!("Private-Key: ({} bit)\n", self.get_bytes()).as_bytes()))
+    Ok(stdout.ends_with("RSA key ok\n".as_bytes()))
   }
 
   fn execute(&self) -> Result<(), Box<dyn Error>> {