make mesh study longer

Two-phase-Richards/two-patch/TP-R-two-patch-test-case/mesh_studies/TP-R-2-patch-mesh-study-all-params-one.py

@@ -58,7 +58,7 @@ resolutions = {
 #  for each element t_0 in starttimes.
 starttimes = [0.0]
 timestep_size = 0.001
-number_of_timesteps = 20
+number_of_timesteps = 800
 
 # LDD scheme parameters  ######################################################
 Lw1 = 0.25 #/timestep_size