remove PotionEffect color API as it was removed upstream

appears that value was never even used anyways

Spigot-API-Patches/PotionEffect-clone-methods.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] PotionEffect clone methods
 
 
 diff --git a/src/main/java/org/bukkit/potion/PotionEffect.java b/src/main/java/org/bukkit/potion/PotionEffect.java
-index 86616f1b8..35984ef6c 100644
+index 86616f1b8..efb55d29c 100644
 --- a/src/main/java/org/bukkit/potion/PotionEffect.java
 +++ b/src/main/java/org/bukkit/potion/PotionEffect.java
 @@ -0,0 +0,0 @@ public class PotionEffect implements ConfigurationSerializable {
@@ -14,25 +14,22 @@ index 86616f1b8..35984ef6c 100644
  
 +    // Paper start
 +    public PotionEffect withType(PotionEffectType type) {
-+        return new PotionEffect(type, duration, amplifier, ambient, particles, color);
++        return new PotionEffect(type, duration, amplifier, ambient, particles, icon);
 +    }
 +    public PotionEffect withDuration(int duration) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
++        return new PotionEffect(this.type, duration, amplifier, ambient, particles, icon);
 +    }
 +    public PotionEffect withAmplifier(int amplifier) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
++        return new PotionEffect(this.type, duration, amplifier, ambient, particles, icon);
 +    }
 +    public PotionEffect withAmbient(boolean ambient) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
++        return new PotionEffect(this.type, duration, amplifier, ambient, particles, icon);
 +    }
 +    public PotionEffect withParticles(boolean particles) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
++        return new PotionEffect(this.type, duration, amplifier, ambient, particles, icon);
 +    }
-+    public PotionEffect withParticles(boolean particles, Color color) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
-+    }
-+    public PotionEffect withColor(Color color) {
-+        return new PotionEffect(this.type, duration, amplifier, ambient, particles, color);
++    public PotionEffect withIcon(boolean icon) {
++        return new PotionEffect(this.type, duration, amplifier, ambient, particles, icon);
 +    }
 +    // Paper end
 +