Copy the table for the default color for bullets

When we create a bullet it is, by default, light red.  We assign a
reference to the ‘Colors.lightRed’ table to the ‘color’ property of
the bullet.  If we later modify the color for that bullet, say from a
pattern definition, then we end up changing the definition of
‘Colors.lightRed’ because of the reference.  So what we actually want
to do when creating a bullet is to copy the color table, which is what
this patch does.