Remove useless parameter

src/main/java/com/myname/mymodid/mixinplugin/Mixin.java

@@ -14,18 +14,15 @@ public enum Mixin {
     //
 
     // Replace with your own mixins:
-    ItemEditableBookMixin("minecraft.ItemEditableBookMixin", false, VANILLA),
+    ItemEditableBookMixin("minecraft.ItemEditableBookMixin", VANILLA),
     // You may also require multiple mods to be loaded if your mixin requires both
-    GT_Block_Ores_AbstractMixin("gregtech.GT_Block_Ores_AbstractMixin", false, GREGTECH, VANILLA);
+    GT_Block_Ores_AbstractMixin("gregtech.GT_Block_Ores_AbstractMixin", GREGTECH, VANILLA);
 
     public final String mixinClass;
     public final List<TargetedMod> targetedMods;
-    // Injecting into @SideOnly(Side.Client) classes will crash the server. Flag them as clientSideOnly!
-    public final boolean clientSideOnly;
 
-    Mixin(String mixinClass, boolean clientSideOnly, TargetedMod... targetedMods) {
+    Mixin(String mixinClass, TargetedMod... targetedMods) {
         this.mixinClass = mixinClass;
         this.targetedMods = Arrays.asList(targetedMods);
-        this.clientSideOnly = clientSideOnly;
     }
 }

src/main/java/com/myname/mymodid/mixinplugin/MixinPlugin.java

@@ -1,7 +1,6 @@
 package com.myname.mymodid.mixinplugin;
 
 import com.myname.mymodid.Tags;
-import cpw.mods.fml.relauncher.FMLLaunchHandler;
 import net.minecraft.launchwrapper.Launch;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -47,7 +46,6 @@ public class MixinPlugin implements IMixinConfigPlugin {
     // This method return a List<String> of mixins. Every mixins in this list will be loaded.
     @Override
     public List<String> getMixins() {
-        final boolean loadClientSideOnlyClasses = FMLLaunchHandler.side().isClient();
         final boolean isDevelopmentEnvironment = (boolean) Launch.blackboard.get("fml.deobfuscatedEnvironment");
 
         List<TargetedMod> loadedMods = Arrays.stream(TargetedMod.values())
@@ -66,8 +64,7 @@ public class MixinPlugin implements IMixinConfigPlugin {
 
         List<String> mixins = new ArrayList<>();
         for (Mixin mixin : Mixin.values()) {
-            if (loadedMods.containsAll(mixin.targetedMods)
-                    && (mixin.clientSideOnly == false || loadClientSideOnlyClasses)) {
+            if (loadedMods.containsAll(mixin.targetedMods)) {
                 mixins.add(mixin.mixinClass);
                 LOG.debug("Loading mixin: " + mixin.mixinClass);
             }