Fix quirks after dragging tab to another window

Fix quirks after dragging tab to another window

The quirks only happened in multi-process, where a new `vim` instance is not
instantiated for the dragged tab. We already update `.browser` and `.window`.
However, all frame script listeners were still using the message manager of the
old `<browser>`, making the `vim` instance miss out on its frame script
messages. For example, this caused the blacklist not to apply when reloading the
page in a tab dragged to another window. This commit adds the listeners for the
new `<browser>` as well.