fix: broken encoding in ColorUtil (section sign char literal)

Author: Cyrusbye720

src/main/java/dev/demonz/zdiscord/util/ColorUtil.java

@@ -59,7 +59,7 @@ public static String toDiscordMarkdown(String text) {
         boolean strike = false;
         for (int i = 0; i < text.length(); i++) {
             char c = text.charAt(i);
-            if ((c == '&' || c == '§') && i + 1 < text.length()) {
+            if ((c == '&' || c == '\u00A7') && i + 1 < text.length()) {
                 char code = Character.toLowerCase(text.charAt(i + 1));
                 i++;
                 switch (code) {