fix: body-length can't be exceeded anymore (#744)

* fix: body-length can't be exceeded anymore

* fix length comparison for `result`

naff/ext/debug_extension/debug_exec.py

@@ -81,8 +81,9 @@ async def debug_exec(self, ctx: InteractionContext) -> Optional[Message]:
             return await self.handle_exec_result(m_ctx, ret, stdout.getvalue(), body)
 
     async def handle_exec_result(self, ctx: ModalContext, result: Any, value: Any, body: str) -> Optional[Message]:
-        if len(body) <= 2000:
-            await ctx.send(f"```py\n{body}```")
+        # body can be of length 2000 and exceed the limit after formatting
+        if len(cmd_body := f"```py\n{body}```") <= 2000:
+            await ctx.send(cmd_body)
 
         else:
             paginator = Paginator.create_from_string(self.bot, body, prefix="```py", suffix="```", page_size=4000)
@@ -123,8 +124,8 @@ async def handle_exec_result(self, ctx: ModalContext, result: Any, value: Any, b
         # prevent token leak
         result = result.replace(self.bot.http.token, "[REDACTED TOKEN]")
 
-        if len(result) <= 2000:
-            return await ctx.send(f"```py\n{result}```")
+        if len(cmd_result := f"```py\n{result}```") <= 2000:
+            return await ctx.send(cmd_result)
 
         else:
             paginator = Paginator.create_from_string(self.bot, result, prefix="```py", suffix="```", page_size=4000)