remove unneded keys

[ci skip]

data/multiplayer/scenarios/2p_Dark_Forecast.cfg

@@ -6,7 +6,6 @@
     description= _ "Dark Forecast is a survival scenario for solitaire or two-player team-based play against randomly-spawned AI units. Victory is achieved by surviving and defeating all enemy waves. During the course of play, the terrain will change based on random weather effects.
 
 Note: You need to use the default map settings for the scenario to work right."
-    turns=-1
     experience_modifier=100
     map_data="{multiplayer/maps/Dark_Forecast_basic.map}"
     victory_when_enemies_defeated=no

data/multiplayer/scenarios/4p_A_New_Land.cfg

@@ -5,7 +5,6 @@
     map_data="{multiplayer/maps/4p_A_New_Land.map}"
     description= _ "This 4p survival scenario allows you to construct buildings and terraform the land. Use map settings. The recommended starting gold is 100."
     experience_modifier=70%
-    turns=unlimited
     force_lock_settings=yes
     define=MULTIPLAYER_A_NEW_LAND_LOAD