Fix modmail alias command when no aliases defined (#1287)

* Fix modmail alias command when no aliases defined

* Make modmail no alias use prepare_deny_embed

Author: dkay0670

techsupport_bot/commands/modmail.py

@@ -1375,11 +1375,13 @@ async def list_aliases(self: Self, ctx: commands.context) -> None:
         # Checks if the command was an alias
         aliases = config.extensions.modmail.aliases.value
         if not aliases:
-            embed = auxiliary.generate_basic_embed(
-                color=discord.Color.green(),
-                description="There are no aliases registered for this guild",
+            embed = auxiliary.prepare_deny_embed(
+                message="There are no aliases registered for this guild",
             )
 
+            await ctx.channel.send(embed=embed)
+            return
+
         embed = discord.Embed(
             color=discord.Color.green(), title="Registered aliases for this guild:"
         )