specs: Fix type of GESTURECLASS num_touches member

This was a copy-paste error from TOUCHCLASS. The protocol structs use
uint8_t for num_touches.

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
10 jobs for num-touches-size in 3 minutes and 36 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Prep
passed #9811328
container-prep

00:00:21

 
  Check
passed #9811329
check formatting

00:01:01

 
  Build
passed #9811332
autotools: []

00:01:03

passed #9811333
autotools: [--enable-legacy]

00:00:54

passed #9811330
meson: []

00:00:24

passed #9811331
meson: [-Dlegacy=true]

00:00:14

 
  Test
passed #9811336
check evdev keysyms

00:00:18

passed #9811338
check versions are in sync

00:00:22

passed #9811335
compare meson and autotools

00:00:50

passed #9811334
meson from tarball

00:00:38