leaflet: Don't include the deprecation macros header

It's not needed anymore.
11 jobs for leaflet-deprecation-include in 17 minutes and 14 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #246201
librem5
api-visibility

00:02:18

passed #246203
librem5
build-debian-clang

00:03:22

passed #246202
librem5
build-debian-gcc

00:02:32

passed #246204
librem5
build-fedora-gcc

00:03:09

 
  Test+Docs
passed #246205
librem5
build-gtkdoc

00:02:24

passed #246206
librem5
unit-test

00:02:21

43.6%
 
  Package
passed #246207
librem5
package-debian-buster

00:02:46

passed #246208
librem5:arm64
package-debian-buster:arm64

00:06:33

failed #246209
flatpak allowed to fail
package-flatpak

00:00:50

 
  Test Package
passed #246210
librem5
autopkgtest-debian-buster-package

00:02:33

passed #246211
librem5
lintian-debian-buster-package

00:00:55

 
Name Stage Failure
failed
package-flatpak Package
Committing stage finish to cache
Exporting sm.puri.Handy.Demo to repo
error: Writing content object: min-free-space-percent '3%' would be exceeded, at least 4.1?kB requested
Export failed: Child process exited with code 1
Uploading artifacts...
_build/meson-logs/meson-log.txt: found 1 matching files
WARNING: sm.puri.Handy.Demo-dev.flatpak: no matching files
Uploading artifacts to coordinator... ok
id=246209 responseStatus=201 Created token=dJjcsCxy
ERROR: Job failed: exit code 1