Fix invalid syntax in site.webmanifest

Author: yasulab

site.webmanifest

@@ -1,20 +1,17 @@
----
----
-
 {
-  "name":       "{{ site.title_short }}",
-  "short_name": "{{ site.title_short }}",
+  "name":       "DojoCon Japan",
+  "short_name": "DojoCon Japan",
   "icons": [
-        {
-            "src": "/img/android-chrome-192x192.png",
-            "sizes": "192x192",
-            "type": "image/png"
-        },
-        {
-            "src": "/img/android-chrome-256x256.png",
-            "sizes": "256x256",
-            "type": "image/png"
-        }
+    {
+      "src":   "/img/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type":  "image/png"
+    },
+    {
+      "src":   "/img/android-chrome-256x256.png",
+      "sizes": "256x256",
+      "type":  "image/png"
+    }
   ],
   "theme_color":      "#ffffff",
   "background_color": "#ffffff",