notmuch: correct test.

notmuch/src/lib.rs

@@ -611,7 +611,7 @@ mod tests {
         let nm = Notmuch::with_config("testdata/notmuch.config");
         nm.new()?;
         let c = nm.count("*")?;
-        assert_eq!(c, 13);
+        assert_eq!(c, 14);
         Ok(())
     }