Remove grey background from price change text

Remove ANSI code block formatting from price change field to eliminate grey background box. Price change now displays as plain text while maintaining color indication via embed border.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

bot.py

@@ -138,19 +138,16 @@ class StockBot(commands.Bot):
         if change_dollar > 0:
             color = discord.Color.green()
             change_emoji = "📈"
-            ansi_color = "\u001b[0;32m"  # Green
         elif change_dollar < 0:
             color = discord.Color.red()
             change_emoji = "📉"
-            ansi_color = "\u001b[0;31m"  # Red
         else:
             color = discord.Color.blue()
             change_emoji = "➡️"
-            ansi_color = "\u001b[0;34m"  # Blue
 
-        # Format change string with ANSI color
+        # Format change string
         change_sign = "+" if change_dollar >= 0 else ""
-        change_str = f"```ansi\n{ansi_color}{change_sign}${change_dollar} ({change_sign}{change_percent}%)\u001b[0m\n```"
+        change_str = f"{change_sign}${change_dollar} ({change_sign}{change_percent}%)"
 
         # Custom title for PYPL ticker
         if ticker == "PYPL":