Correct og:image meta tag formatting in default layout

Author: meo2326cc

_layouts/default.html

@@ -27,7 +27,7 @@
     <meta property="og:type" content="website" />
     <meta name="twitter:card" content="summary_large_image" />
     <meta name="twitter:image" content="https://2025.rubyconf.tw/assets/images/conf_og.jpg">
-    <meta property=”og:image” content="https://2025.rubyconf.tw/assets/images/conf_og.jpg" />
+    <meta property="og:image" content="https://2025.rubyconf.tw/assets/images/conf_og.jpg" />
     <script
       defer
       src="https://unpkg.com/alpinejs@3.x.x/dist/cdn.min.js"