Fix self damage awarding skill xp (#5233)

Author: Warriorrrr

src/main/java/com/gmail/nossr50/util/skills/CombatUtils.java

@@ -935,7 +935,8 @@ public static void processCombatXP(@NotNull McMMOPlayer mmoPlayer,
         XPGainReason xpGainReason;
 
         if (target instanceof Player defender) {
-            if (!ExperienceConfig.getInstance().getExperienceGainsPlayerVersusPlayerEnabled()
+            if (defender.equals(mmoPlayer.getPlayer())
+                    || !ExperienceConfig.getInstance().getExperienceGainsPlayerVersusPlayerEnabled()
                     ||
                     (mcMMO.p.getPartyConfig().isPartyEnabled()
                             && mcMMO.p.getPartyManager()