[FEM] Elmer: scale EigenMode results

- for an not yet known reason the result from Elmer are only for eigen analyses a factor 1000 (we send the mesh scaled to Elmer and it seems the eigen solver does not notice this)
Therefore scale these results

src/Mod/Fem/femsolver/elmer/tasks.py

@@ -256,6 +256,10 @@ class Results(run.Results):
         # this might be changed in future, therefore leave this
         # self.solver.ElmerResult.scale(1000)
 
+        # for eigen analyses the resulting values are by a factor 1000 to high
+        # therefore scale all *EigenMode results
+        self.solver.ElmerResult.ViewObject.transformField("displacement EigenMode1", 0.001)
+
         self.solver.ElmerResult.recomputeChildren()
         self.solver.Document.recompute()
         # recompute() updated the result mesh data