Remove unnecessary space from countdown exercise

Author: chvmvd

docs/2-browser-apps/03-class/_samples/count-down/script.js

@@ -4,4 +4,4 @@ const now = new Date();
 const remainingHours = 23 - now.getHours();
 const remainingMinutes = 59 - now.getMinutes();
 const remainingSeconds = 60 - now.getSeconds();
-countdownBox.textContent = `今日は残り${remainingHours}時間 ${remainingMinutes}分 ${remainingSeconds}秒です。`;
+countdownBox.textContent = `今日は残り${remainingHours}時間${remainingMinutes}分${remainingSeconds}秒です。`;

docs/2-browser-apps/03-class/index.mdx

@@ -415,7 +415,7 @@ const now = new Date();
 const remainingHours = 23 - now.getHours();
 const remainingMinutes = 59 - now.getMinutes();
 const remainingSeconds = 60 - now.getSeconds();
-countdownBox.textContent = `今日は残り${remainingHours}時間 ${remainingMinutes}分 ${remainingSeconds}秒です。`;
+countdownBox.textContent = `今日は残り${remainingHours}時間${remainingMinutes}分${remainingSeconds}秒です。`;
 ```
 
 <ViewSource url={import.meta.url} path="_samples/count-down" />