[FEM] Elmer: fix broken example

- (a regression to FC 0.20.0), use new settings ("direct" is already the default, iterative solving takes here about 5 times longer, DisplaceMesh must be False)

src/Mod/Fem/femexamples/elmer_nonguitutorial01_eigenvalue_of_elastic_beam.py

@@ -89,11 +89,9 @@ def setup(doc=None, solvertype="elmer"):
     elif solvertype == "elmer":
         solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
         eq_obj = ObjectsFem.makeEquationElasticity(doc, solver_obj)
-        eq_obj.LinearSolverType = "Direct"
-        # direct solver was used in the tutorial, thus used here too
-        # the iterative is much faster and gives the same results
-        eq_obj.DoFrequencyAnalysis = True
+        eq_obj.EigenAnalysis = True
         eq_obj.CalculateStresses = True
+        eq_obj.DisplaceMesh = False
     else:
         FreeCAD.Console.PrintWarning(
             "Not known or not supported solver type: {}. "