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Rather than adding and removing shortcuts when the composer's web view gains and loses focus to avoid invoking main window shortcuts, just rely on standard GTK action scoping rules. This fixes editing shortcuts like Ctrl+I breaking when clicking on toolbar buttons, a crasher because the composer left the undo button enabled after it was closed, and allows Escape to close the composer from anywherre. Fixes https://bugzilla.gnome.org/show_bug.cgi?id=774651, https://bugzilla.gnome.org/show_bug.cgi?id=785187, and https://bugzilla.gnome.org/show_bug.cgi?id=741741
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