refactor: change np.atleast_2d to np.reshape

src/psimpy/simulator/run_simulator.py

@@ -168,7 +168,8 @@ class RunSimulator:
             kwargs of one simulation.     
         prefixes : list of str
         """
-        var_samples = np.atleast_2d(var_samples)
+        if var_samples.ndim == 0 or var_samples.ndim == 1:
+            var_samples = np.reshape(var_samples, (1, -1))           
 
         if var_samples.shape[1] != len(self.var_inp_parameter):
             raise ValueError(