Change Maize params

Updated Zmax, SxBotQ and SxTopQ based on ST's findings when changing Zmax to 2.0 in AQ Windows

Author: chris-s-bowden

aquacrop/entities/crops/crop_params.py

@@ -522,8 +522,8 @@
   'Senescence': -9.0,
   'SenescenceCD': 107.0,
   'SwitchGDD': 0,
-  'SxBotQ': 0.011,
-  'SxTopQ': 0.045,
+  'SxBotQ': 0.0117,
+  'SxTopQ': 0.048,
   'Tbase': 8.0,
   'Tmax_lo': 45.0,
   'Tmax_up': 40.0,
@@ -536,7 +536,7 @@
   'YldForm': -9.0,
   'YldFormCD': 61.0,
   'YldWC': 90,
-  'Zmax': 2.3,
+  'Zmax': 2.0,
   'Zmin': 0.3,
   'a_HI': 7.0,
   'b_HI': 3.0,