[four-in-a-row] Fix label alignment.

[Arnaud B. <arnaudb src gnome org>]

commit 48ffc9cff7cbe0f76ed3d55ac49667b883ade2b6
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Aug 19 00:20:52 2019 +0200

    Fix label alignment.

 src/prefs-box.vala | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/prefs-box.vala b/src/prefs-box.vala
index 98ecf9c..a85d59d 100644
--- a/src/prefs-box.vala
+++ b/src/prefs-box.vala
@@ -53,7 +53,9 @@ class PrefsBox : Gtk.Dialog {
         label = new Gtk.Label(_("Game"));
         notebook.append_page(grid, label);
 
-        label = new Gtk.Label(_("Opponent:"));
+        label = new Gtk.Label(_("Opponent:"));  // TODO add a mnemonic, like for _Theme:
+        label.set_xalign((float)0.0);
+        label.set_yalign((float)0.5);
         label.set_hexpand(true);
         grid.attach(label,0,0 ,1, 1);
 
@@ -86,6 +88,7 @@ class PrefsBox : Gtk.Dialog {
         label = new Gtk.Label.with_mnemonic(_("_Theme:"));
         label.set_xalign((float)0.0);
         label.set_yalign((float)0.5);
+        label.set_hexpand(true);
         grid.attach(label, 0, 1, 1, 1);
 
         combobox_theme = new Gtk.ComboBoxText();