Fix max nick length with hex color codes (#6185)

Hex color codes convert to the obnoxious md5 format which massively
inflates the character count than what the user entered. Unformat the
nickname before getting the length to remain true to what the user
entered as the command argument.

Fixes #6174

Author: JRoy

Essentials/src/main/java/com/earth2me/essentials/commands/Commandnick.java

@@ -5,7 +5,6 @@
 import com.earth2me.essentials.utils.FormatUtil;
 import net.ess3.api.TranslatableException;
 import net.ess3.api.events.NickChangeEvent;
-import org.bukkit.ChatColor;
 import org.bukkit.Server;
 
 import java.util.Collections;
@@ -87,7 +86,10 @@ private boolean isNickBanned(final String newNick) {
     }
 
     private int getNickLength(final String nick) {
-        return ess.getSettings().ignoreColorsInMaxLength() ? ChatColor.stripColor(nick).length() : nick.length();
+        if (ess.getSettings().ignoreColorsInMaxLength()) {
+            return FormatUtil.stripFormat(nick).length();
+        }
+        return FormatUtil.unformatString(nick).length();
     }
 
     private boolean nickInUse(final User target, final String nick) {