Fix sign reading in specific cases where the "text" key is omitted

Author: onebeastchris

core/src/main/java/org/geysermc/geyser/translator/text/MessageTranslator.java

@@ -458,7 +458,7 @@ private static Component componentFromNbtTag(Object nbtTag, Style style) {
             return Component.join(JoinConfiguration.noSeparators(), componentsFromNbtList(list, style));
         } else if (nbtTag instanceof NbtMap map) {
             Component component = null;
-            String text = map.getString("text", null);
+            String text = map.getString("text", map.getString("", null));
             if (text != null) {
                 component = Component.text(text);
             } else {