[sysprof] app: make About dialog modal

[Christian Hergert <chergert src gnome org>]

commit be65d01385c60d2a442e2d465302fd05296fa804
Author: Dimitrios Christidis <dimitrios christidis me>
Date:   Sat Apr 8 14:32:15 2017 +0200

    app: make About dialog modal
    
    Makes Sysprof consistent with other GNOME applications.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781053

 src/sp-application.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/sp-application.c b/src/sp-application.c
index 5e2c0da..0203ac7 100644
--- a/src/sp-application.c
+++ b/src/sp-application.c
@@ -175,6 +175,7 @@ sysprof_about (GSimpleAction *action,
                          "copyright", "Copyright © 2004-2009 Søren Sandmann Pedersen\n"
                                       "Copyright © 2016 Christian Hergert",
                          "transient-for", best_toplevel,
+                         "modal", TRUE,
                          "translator-credits", _("translator-credits"),
                          "license-type", GTK_LICENSE_GPL_3_0,
                          "logo-icon-name", "sysprof",