Key binding for 'Q' must be rebound for Emacs 30

[emaxite]

Hi,

pdf-view-mode-map currently binds 'Q' to 'kill-this-buffer'.
As of Emacs 30, this command must be bound to a mouse event and cannot be invoked through a key binding.
Instead, 'Q' should be bound to 'kill-current-buffer'. This also works for older Emacsen.