Adjust flight level at which helicopter energy consumption increases

We have an island at ~350 height and want to fly there, so let's bump the
consumption limit to 400.

patches/02_adjust-helicopter-consumption-height.patch

@@ -0,0 +1,11 @@
+--- a/helicopter/heli_control.lua
++++ b/helicopter/heli_control.lua
+@@ -157,7 +157,7 @@ function helicopter.heli_control(self, d
+         local altitude_consumption_variable = 0
+ 
+         -- if gaining altitude, it consumes more power
+-        local y_pos_reference = position.y - 200 --after altitude 200 the power need will increase
++        local y_pos_reference = position.y - 400 --after altitude 200 the power need will increase
+         if y_pos_reference > 0 then altitude_consumption_variable = ((y_pos_reference/1000)^2) end
+ 
+         local consumed_power = (power/1500) + altitude_consumption_variable

patches/series

@@ -1 +1,2 @@
 01_columnia-acacia-tree-from-default.patch
+02_adjust-helicopter-consumption-height.patch