Remove needless EditSession#getWorld for setting blocks/biomes in a couple of cases

#32 IntellectualSites/FastAsyncWorldEdit-Adapters#7

worldedit-core/src/main/java/com/sk89q/worldedit/function/generator/ForestGenerator.java

@@ -60,7 +60,7 @@ public class ForestGenerator implements RegionFunction {
             // we trick editsession history here in the first call
             editSession.setBlock(position, BlockTypes.AIR.getDefaultState());
             // and then trick the generator here by directly setting into the world
-            editSession.getWorld().setBlock(position, BlockTypes.AIR.getDefaultState());
+            editSession.setBlock(position, BlockTypes.AIR.getDefaultState());
             // so that now the generator can generate the tree
             boolean success = treeType.generate(editSession, position);
             if (!success) {

worldedit-core/src/main/java/com/sk89q/worldedit/regions/shape/ArbitraryBiomeShape.java

@@ -135,7 +135,7 @@ public abstract class ArbitraryBiomeShape {
             if (!hollow) {
                 final BiomeType material = getBiome(x, y, z, baseBiome);
                 if (material != null) {
-                    editSession.getWorld().setBiome(position, material);
+                    editSession.setBiome(position, material);
                     ++affected;
                 }
 
@@ -151,7 +151,7 @@ public abstract class ArbitraryBiomeShape {
                 continue;
             }
 
-            editSession.getWorld().setBiome(position, material);
+            editSession.setBiome(position, material);
             ++affected;
         }