[libpeas] build: fix typo in meson port

[Christian Hergert <chergert src gnome org>]

commit 60893b189918f9211f9d17688f81977b5c1dc0aa
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 5 17:15:28 2019 -0700

    build: fix typo in meson port

 loaders/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/loaders/meson.build b/loaders/meson.build
index 7b9ce98..d86cbf9 100644
--- a/loaders/meson.build
+++ b/loaders/meson.build
@@ -2,7 +2,7 @@ if build_lua51_loader == true
   subdir('lua5.1')
 endif
 
-if build_python3_loader == true
+if build_python2_loader == true
   subdir('python')
 endif