deleting isinstance statement from progressbar. It's already done in particleset.py

Author: nilodna

parcels/_core/particleset.py

@@ -571,9 +571,7 @@ def execute(
                         next_output += outputdt
 
             if verbose_progress:
-                if isinstance(time, np.datetime64) or isinstance(time, np.timedelta64):
-                    pbar.set_description("Integration time: " + str(time))
-
+                pbar.set_description("Integration time: " + str(time))
                 pbar.update((next_time - time) / np.timedelta64(1, "s"))
 
             time = next_time