[libchamplain] Fix gtk detection in meson

[Jiří Techet <jiritechet src gnome org>]

commit 1c95ddb8a28b4d2e136f831ca8287d41b7180108
Author: Jiří Techet <techet gmail com>
Date:   Thu Feb 7 11:56:01 2019 +0100

    Fix gtk detection in meson

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 648e5e0..ede3214 100644
--- a/meson.build
+++ b/meson.build
@@ -108,7 +108,7 @@ if build_gtk_doc and not gtk_doc_dep.found()
 endif
 
 build_gtk_widgetry = get_option('widgetry')
-if build_gtk_widgetry and not gtk_doc_dep.found()
+if build_gtk_widgetry and not gtk_dep.found()
   build_gtk_widgetry = false
 elif build_gtk_widgetry and not clutter_gtk_dep.found()
   build_gtk_widgetry = false