Undeprecate the unload event

Author: ddbeck

api/Window.json

@@ -7478,7 +7478,7 @@
           "status": {
             "experimental": false,
             "standard_track": true,
-            "deprecated": true
+            "deprecated": false
           }
         }
       },
@@ -7518,7 +7518,6 @@
       },
       "viewport": {
         "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Window/viewport",
           "spec_url": "https://drafts.csswg.org/css-viewport/#dom-window-viewport",
           "tags": [
             "web-features:viewport-segments"