Fix self-contact tests

Change in partioning has reduced the number of linear iterations.

Author: mayrmt

tests/input_files/contact3D_unbiased_self_tet4_nitsche_ele_new_struct.dat

@@ -66,7 +66,7 @@ STRUCTURE DIS structure NODE 4446 QUANTITY dispx VALUE -7.56660272965204994e-02
 STRUCTURE DIS structure NODE 4446 QUANTITY dispy VALUE -4.94118281281218791e-02 TOLERANCE 1e-11
 STRUCTURE DIS structure NODE 4130 QUANTITY dispx VALUE -6.70217346751526000e-02 TOLERANCE 1e-11
 STRUCTURE DIS structure NODE 4130 QUANTITY dispy VALUE 7.63046398429986263e-03 TOLERANCE 1e-11
-STRUCTURE SPECIAL true QUANTITY num_iter_step_3 VALUE 10.0 TOLERANCE 1.0e-20
+STRUCTURE SPECIAL true QUANTITY num_iter_step_3 VALUE 9.0 TOLERANCE 1.0e-20
 ------------------------------------DESIGN POINT DIRICH CONDITIONS
 // points_left_side
 E 1 NUMDOF 3 ONOFF 1 1 1 VAL 0.0 0.0 0.0 FUNCT none none none