wlr_seat: Declare functions in the same order for pointer, keyboard, and touch
wlr_seat: Declare functions in the same order for pointer, keyboard, and touch

These three APIs are very similar to one another, but they all had
slightly different function orderings. For consistency, always declare
the non_`notify` functions first, then the `notify` functions, then
`{start,end,has}_grab`.

This change has no functional effect.

ascent12/wlroots,SirCmpwn/wlroots,ascent12/wlroots,swaywm/wlroots,swaywm/wlroots