Get table names from data. Update post scores to use HighscoresData class.

utilities/highscores_data.py

@@ -112,7 +112,7 @@ class HighscoresData:
         @param table: table to get category data from
         @returns: list of tuples containing all category and relative score data.
         """
-        return self._data[str(guild_id)][table]["categories"].items()
+        return self._data[str(guild_id)]["tables"][table]["categories"].items()
 
     def get_config_highscore_size(self) -> int:
         """
@@ -149,6 +149,22 @@ class HighscoresData:
         """
         return self._data[str(guild_id)]["tables"][table]["message_id"]
 
+    def get_table_names(self, guild_id) -> "list[str]":
+        """
+        Returns a list of table names.
+
+        @param guild_id: guild id to retrieve from.
+        @returns: list of table names
+        """
+        tables: "list[str]" = []
+
+        for table, data in self._data[str(guild_id)][  # pylint: disable=unused-variable
+            "tables"
+        ].items():
+            tables.append(table)
+
+        return tables
+
     def remove_guild(self, guild_id: int, guild_name: str) -> None:
         """
         Removes a guild's data from object. Saves backup.