remove extra copy of log-likelihood (#2347)

Co-authored-by: andrewdipper <[email protected]>

arviz/data/io_numpyro.py

@@ -194,7 +194,7 @@ def log_likelihood_to_xarray(self):
             )
             for obs_name, log_like in log_likelihood_dict.items():
                 shape = (self.nchains, self.ndraws) + log_like.shape[1:]
-                data[obs_name] = np.reshape(log_like.copy(), shape)
+                data[obs_name] = np.reshape(np.asarray(log_like), shape)
         return dict_to_dataset(
             data,
             library=self.numpyro,