Fix global converter

Author: dragdev

riftgun/converters.py

@@ -39,7 +39,7 @@ def convertSync(ctx, argument: str) -> discord.TextChannel:
         """Converts a provided argument to a text channel."""
         if argument.isdigit(): argument = int(argument)
 
-        def match(channel: typing.Union[discord.TextChannel, discord.VoiceChannel, discord.CategoryChannel]):
+        def match(channel: discord.TextChannel):
             if channel.id == argument:
                 return True
             else:
@@ -50,10 +50,7 @@ def match(channel: typing.Union[discord.TextChannel, discord.VoiceChannel, disco
                 elif argument in channel.name:
                     return True
 
-        channel = discord.utils.find(match, sorted(ctx.bot.channels, key=lambda x: x.last_message))
+        channel = discord.utils.find(match, sorted(ctx.bot.text_channels, key=lambda x: x.last_message))
 
         if channel: return channel
-        else: raise commands.BadArgument(f"Unable to convert \"{argument}\" to TextChannel, globally or locally.")
-
-    def __call__(self, *args, **kwargs):
-        self.convertSync(args[0], args[1])
+        else: raise commands.BadArgument(f"Unable to convert \"{argument}\" to TextChannel, globally or locally.")