fix: Prevent same entity

Author: JasperLorelai

core/src/main/java/com/nisovin/magicspells/spells/buff/ProxySpell.java

@@ -31,6 +31,7 @@ public ProxySpell(MagicConfig config, String spellName) {
 
 	@Override
 	public boolean castBuff(SpellData data) {
+		if (data.target().equals(data.caster())) return false;
 		proxies.put(data.target().getUniqueId(), data.caster());
 		return true;
 	}