Fix some issues in using power method for EIG

src/msspec/parameters.py

@@ -1536,7 +1536,7 @@ class CalculationParameters(BaseParameters):
                     #assert( p.value in (None, 'Sigma_n', 'G_n') ) 
                     assert( p.value in p.allowed_values)
             elif (self.global_parameters.spectroscopy == 'EIG'
-                and self.global_parameters.algorithm == 'power'):
+                and self.global_parameters.algorithm == 'inversion'):
                     assert( p.value in p.allowed_values)
             else:
                 assert( p.value is None )