[gnome-builder] build: drop with_ from with_channel in meson_options.txt

[Christian Hergert <chergert src gnome org>]

commit 3382a5157487b5f5d0c6a1bd46a1f23c77cf1da9
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 12 20:46:31 2019 -0700

    build: drop with_ from with_channel in meson_options.txt

 build-aux/flatpak/org.gnome.Builder.json | 2 +-
 meson_options.txt                        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 3e1709ff9..648684768 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -560,8 +560,8 @@
                 "-Dpython_libprefix=python3.7",
                 "-Denable_tracing=true",
                 "-Dwith_help=true",
-                "-Dwith_channel=flatpak-nightly",
                 "-Dwith_deviced=true"
+                "-Dchannel=flatpak-nightly",
             ],
             "cleanup" : [
                 "/share/gnome-builder/gir-1.0",
diff --git a/meson_options.txt b/meson_options.txt
index 3028c49bb..57fe9301c 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -5,7 +5,7 @@ option('tcmalloc', type: 'boolean', value: false, description: 'Use tcmalloc for
 
 option('with_safe_path', type: 'string', value: '', description: 'PATH variable to run build commands 
(default: platform-specific)')
 
-option('with_channel',
+option('channel',
           type: 'combo',
        choices: [ 'other', 'flatpak-stable', 'flatpak-beta', 'flatpak-nightly' ],
    description: 'The distribution channel for Builder',