reordinator.glade: Specify the required GTK+ version as 3.2

Glade informed of the following:

    [window1:box1:box2:scrolledwindow1:treeview1:treeview-selection1]
    Property 'Mode' of object class 'Tree Selection' was introduced in
    gtk+ 3.2

Previously we just specified version 3.0, up that to 3.2

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
reordinator.glade: Fix deprecated 'Move Up' button signal

Glade informed about a deprecated button signal for the 'Move Up'
button.

    [window1:box1:box2:buttonbox1:button1] Signal 'pressed' of object
    class 'Button' is deprecated

For some reason while the other buttons are using the 'clicked' signal
this was using the 'pressed' singal, so switch it to match the others.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
reordinator.glade: Non semantic-al glade file changes

New glade (3.16.1) seems to want to shift some stuff around.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Version 003

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>