[four-in-a-row/KaKnife/four-in-a-row-vala: 41/65] fixed issue with prefbox

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 40f20f2d406243dd48c1319e39b10d2871dd9d25
Author: Jacob Humphrey <jacob ryan humphrey gmail com>
Date:   Fri Dec 14 22:33:45 2018 -0600

    fixed issue with prefbox

 src/prefs.vala | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/prefs.vala b/src/prefs.vala
index 8dccbdc..02b957c 100644
--- a/src/prefs.vala
+++ b/src/prefs.vala
@@ -235,6 +235,10 @@ public void prefsbox_open() {
 
     /* connect signals */
     prefsbox.response.connect(() => {prefsbox.hide();});
+    prefsbox.delete_event.connect((event) => {
+        prefsbox.hide();
+        return true;
+    });
     combobox_theme.changed.connect(on_select_theme);
 
     checkbutton_sound.toggled.connect(p.on_toggle_sound);