refactor(snippets/json): remove width and height for oembed field snippet

these settings are rarely used since the default setting is usually fine

Author: Doğa Gürdal

snippets/json.json

@@ -86,9 +86,7 @@
       "{",
       "\t\"label\": \"$1\",",
       "\t\"name\": \"$2\",",
-      "\t\"type\": \"oembed\",",
-      "\t\"width\": ${3:100},",
-      "\t\"height\": ${4:100}",
+      "\t\"type\": \"oembed\"",
       "}"
     ]
   },