Remove toggle from biome/region sapling config & prevent non-iris world

src/main/java/com/volmit/iris/engine/object/IrisBiome.java

@@ -84,9 +84,6 @@ public class IrisBiome extends IrisRegistrant implements IRare {
     @Desc("Sapling override settings")
     private IrisSaplings saplings = new IrisSaplings();
 
-    @Desc("Enable sapling overrides")
-    private boolean useSaplings = false;
-
     @ArrayType(min = 1, type = IrisEffect.class)
     @Desc("Effects are ambient effects such as potion effects, random sounds, or even particles around each player. All of these effects are played via packets so two players won't see/hear each others effects.\nDue to performance reasons, effects will play arround the player even if where the effect was played is no longer in the biome the player is in.")
     private KList<IrisEffect> effects = new KList<>();

src/main/java/com/volmit/iris/engine/object/IrisRegion.java

@@ -82,9 +82,6 @@ public class IrisRegion extends IrisRegistrant implements IRare {
     @Desc("Sapling override settings")
     private IrisSaplings saplings = new IrisSaplings();
 
-    @Desc("Enable sapling overrides")
-    private boolean useSaplings = false;
-
     @MinNumber(1)
     @MaxNumber(128)
     @Desc("The rarity of the region")