KneeSimulator : Updated test's ignore_errors to fit AnyBody.8.1 better and to be more flexible for minor changes

Author: mdabt

Tests/Applications/test_KneeSimulator.any

@@ -7,7 +7,7 @@
 //pytest_markers=["slow"]
 //# Ignore a specific a specific quirk in the model, where sigle time step was not converging
 //# to the specified tolerance (AB#2486)
-//ignore_errors = ['Too many iterations used (final force error = 0.121916)']
+//ignore_errors = ['causes looping of Newton method (final force error = 0.']
 //save_study=[
 //  "Main.KneeSimulatorStudy",
 //]