[gnome-boxes/abderrahim/vala-fix] app-window: fix error detected by latest vala

[Abderrahim Kitouni <akitouni src gnome org>]

commit 7ab5c777383df51a68f8bc3f99f0fd408804581a
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Fri Oct 25 09:40:57 2019 +0100

    app-window: fix error detected by latest vala
    
    See https://gitlab.gnome.org/GNOME/vala/issues/869

 src/app-window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/app-window.vala b/src/app-window.vala
index 8a1ebb6a..82a9f834 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -438,7 +438,7 @@ public bool on_key_pressed (Widget widget, Gdk.EventKey event) {
 
             return true;
         } else if (event.keyval == Gdk.Key.A &&
-                   (event.state & default_modifiers) == Gdk.ModifierType.CONTROL_MASK | 
Gdk.ModifierType.SHIFT_MASK) {
+                   (event.state & default_modifiers) == (Gdk.ModifierType.CONTROL_MASK | 
Gdk.ModifierType.SHIFT_MASK)) {
             foreach_view ((view) => { view.unselect_all (); });
 
             return true;