Fix the player not being able to harm himself while on a team (#353)

Author: ellieisjelly

src/main/java/xyz/nucleoid/plasmid/api/game/common/team/TeamManager.java

@@ -339,7 +339,7 @@ private EventResult onDamagePlayer(ServerPlayer player, DamageSource source, flo
             var playerTeam = this.teamFor(player);
             var attackerTeam = this.teamFor(attacker);
 
-            if (playerTeam != null && playerTeam == attackerTeam && !this.getTeamConfig(playerTeam).friendlyFire()) {
+            if (playerTeam != null && playerTeam == attackerTeam && !player.equals(attacker) && !this.getTeamConfig(playerTeam).friendlyFire()) {
                 return EventResult.DENY;
             }
         }