xfce4-terminal: change switch tab shortcut

Edit file .config/xfce4/terminal/accels.scm

Before:

; (gtk_accel_path "<Actions>/terminal-window/prev-tab" "<Primary>Page_Up")
; (gtk_accel_path "<Actions>/terminal-window/next-tab" "<Primary>Page_Down")

After:

(gtk_accel_path "<Actions>/terminal-window/prev-tab" "<Primary><Shift>Left")
(gtk_accel_path "<Actions>/terminal-window/next-tab" "<Primary><Shift>Right")

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