[glom/gtkmm4v4] gtkmm4: Adapt to changed SizeGroup::Mode enum.

[Murray Cumming <murrayc src gnome org>]

commit 12dbc6b62e12fbb0bb1ea8068455e05e2d0a5655
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Apr 17 13:13:30 2017 +0200

    gtkmm4: Adapt to changed SizeGroup::Mode enum.

 glom/mode_data/flowtablewithfields.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glom/mode_data/flowtablewithfields.cc b/glom/mode_data/flowtablewithfields.cc
index c7e8339..78bc8d4 100644
--- a/glom/mode_data/flowtablewithfields.cc
+++ b/glom/mode_data/flowtablewithfields.cc
@@ -1229,7 +1229,7 @@ void FlowTableWithFields::align_child_group_labels()
   type_vec_sizegroups vec_sizegroups(max_columns);
   for(guint i = 0; i < max_columns; ++i)
   {
-    vec_sizegroups[i] = Gtk::SizeGroup::create(Gtk::SizeGroupMode::HORIZONTAL);
+    vec_sizegroups[i] = Gtk::SizeGroup::create(Gtk::SizeGroup::Mode::HORIZONTAL);
   }
 
   for(const auto& subtable : m_sub_flow_tables)