fix a crash without AntiIDConflict.

We don't need this patch without it anyways.

src/main/java/com/falsepattern/endlessids/mixin/mixins/common/vanilla/biome/BiomeGenBasePlaceholderMixin.java

@@ -1,52 +0,0 @@
-package com.falsepattern.endlessids.mixin.mixins.common.vanilla.biome;
-
-import com.falsepattern.endlessids.PlaceholderBiome;
-import org.spongepowered.asm.lib.Opcodes;
-import org.spongepowered.asm.mixin.Final;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Mutable;
-import org.spongepowered.asm.mixin.Shadow;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.ModifyVariable;
-import org.spongepowered.asm.mixin.injection.Redirect;
-
-import net.minecraft.world.biome.BiomeGenBase;
-
-@Mixin(BiomeGenBase.class)
-public abstract class BiomeGenBasePlaceholderMixin {
-    @Shadow
-    @Final
-    private static BiomeGenBase[] biomeList;
-
-    @Mutable
-    @Shadow
-    @Final
-    public int biomeID;
-
-    private static ThreadLocal<Boolean> wantsRegister;
-
-    @Redirect(method = "<init>(IZ)V",
-              at = @At(value = "FIELD",
-                       opcode = Opcodes.PUTFIELD,
-                       target = "Lnet/minecraft/world/biome/BiomeGenBase;biomeID:I"),
-              require = 1)
-    private void removePlaceholders(BiomeGenBase instance, int id) {
-        if (wantsRegister.get()) {
-            if (biomeList[id] instanceof PlaceholderBiome) {
-                biomeList[id] = null;
-            }
-        }
-        biomeID = id;
-    }
-
-    @ModifyVariable(method = "<init>(IZ)V",
-                    at = @At(value = "HEAD"),
-                    index = 2,
-                    require = 1,
-                    argsOnly = true)
-    private static boolean modifyArg(boolean register) {
-        if (wantsRegister == null) wantsRegister = new ThreadLocal<>();
-        wantsRegister.set(register);
-        return register;
-    }
-}

src/main/java/com/falsepattern/endlessids/mixin/plugin/Mixin.java

@@ -34,8 +34,6 @@ public enum Mixin implements IMixin {
     //region Minecraft->common->biome
     BiomeDictionaryMixin(Side.COMMON, always(), "vanilla.biome.BiomeDictionaryMixin"),
     BiomeGenBaseMixin(Side.COMMON, always(), "vanilla.biome.BiomeGenBaseMixin"),
-    BiomesGenBasePlaceholderMixin(Side.COMMON, avoid(TargetedMod.ANTIIDCONFLICT),
-                                  "vanilla.biome.BiomeGenBasePlaceholderMixin"),
     //endregion Minecraft->common->biome
     //region Minecraft->common->misc
     BlockFireMixin(Side.COMMON, always(), "vanilla.misc.BlockFireMixin"),