[Birthday] FIx handling for more than 25 upcoming birthdays

Closes #129

birthday/commands.py

@@ -196,8 +196,9 @@ async def upcoming(self, ctx: commands.Context, days: int = 7):
 
         embed = discord.Embed(title="Upcoming Birthdays", colour=await ctx.embed_colour())
 
-        if len(parsed_bdays) > 25:
+        if len(sorted_parsed_bdays) > 25:
             embed.description = "Too many days to display. I've had to stop at 25."
+            sorted_parsed_bdays = sorted_parsed_bdays[:25]
 
         for day, members in sorted_parsed_bdays:
             embed.add_field(name=number_day_mapping.get(day), value="\n".join(members))