skal authored Nov 04, 2016 and Jehan committed Nov 06, 2016

Use the `value_pointer` parameter instead of modifying the globale
`gsvals.default_delay`. This doesn't change anything in current code
where file_gif_spin_button_int_init() is only used for connecting this
variable to the delay spin button, but could have been a problem if it
were reused in the future.