fix: only apply block mixin on 1.8.9

Author: Sychic

src/main/java/club/sk1er/patcher/mixins/features/cropheight/BlockMixin_CropHitbox.java

@@ -12,8 +12,10 @@
 
 @Mixin(Block.class)
 public class BlockMixin_CropHitbox {
+    //#if MC==10809
     @Inject(method = "collisionRayTrace", at = @At("HEAD"))
     public void collisionRayTrace(World worldIn, BlockPos pos, Vec3 start, Vec3 end, CallbackInfoReturnable<MovingObjectPosition> cir) {
 
     }
+    //#endif
 }