[gnome-builder] rls: disable rls plugin (and prefer rust_analyzer) by default

[Christian Hergert <chergert src gnome org>]

commit b29abab81ce68de0cdd865a89942224777be3f16
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 11 17:05:29 2020 -0700

    rls: disable rls plugin (and prefer rust_analyzer) by default

 meson_options.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 0a103b57e..f187c821f 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -64,7 +64,7 @@ option('plugin_python_pack', type: 'boolean')
 option('plugin_qemu', type: 'boolean')
 option('plugin_quick_highlight', type: 'boolean')
 option('plugin_retab', type: 'boolean')
-option('plugin_rls', type: 'boolean')
+option('plugin_rls', type: 'boolean', value: false)
 option('plugin_rust_analyzer', type: 'boolean')
 option('plugin_rustup', type: 'boolean')
 option('plugin_shellcmd', type: 'boolean')