readjust solver tol

Two-phase-Richards/multi-patch/layered_soil_with_inner_patch/TP-R-layered_soil_with_inner_patch-realistic.py

@@ -49,7 +49,7 @@ resolutions = {
                 # 2: 2e-6,  # h=1.1180
                 # 4: 2e-6,  # h=0.5590
                 # 8: 2e-6,  # h=0.2814
-                16: 1e-5, # h=0.1412
+                16: 5e-6, # h=0.1412
                 # 32: 5e-6,
                 # 64: 2e-6,
                 # 128: 2e-6