mse: Updated documentation cache

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8512>

subprojects/gst-plugins-bad/docs/plugins/gst_plugins_cache.json

@@ -228202,7 +228202,7 @@
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "default": "18446744073709551615",
+                        "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
                         "mutable": "null",