Fix casing issue

bot.py

@@ -515,7 +515,7 @@ async def groupvc_command(ctx: commands.Context):
     if ctx.channel.category is not None:
         guild: discord.Guild = ctx.guild
         channel: discord.TextChannel = ctx.channel
-        if channel.category.name.lower() == config_get("groups-category", guild.id):
+        if channel.category.name.lower() == config_get("groups-category", guild.id).lower():
             role = await find_role_case_insensitive(guild, channel.name, config_get("groups-role-prefix", guild.id))
             if role is None:
                 await ctx.send("Couldn't resolve group role!")