[gitg] Add missing Preferences shortcut

[Alberto Fanjul <albfan src gnome org>]

commit 6af6dc4bac4d23d2ed0f4c18efdb1c2ac1f35700
Author: Sabri Ünal <libreajans gmail com>
Date:   Mon Feb 3 19:24:24 2020 +0300

    Add missing Preferences shortcut

 gitg/resources/ui/gitg-shortcuts.ui | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/gitg/resources/ui/gitg-shortcuts.ui b/gitg/resources/ui/gitg-shortcuts.ui
index 23e477ef..319535e0 100644
--- a/gitg/resources/ui/gitg-shortcuts.ui
+++ b/gitg/resources/ui/gitg-shortcuts.ui
@@ -47,6 +47,13 @@
                 <property name="title" translatable="yes" context="shortcut window">Open the help</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="accelerator">&lt;primary&gt;comma</property>
+                <property name="title" translatable="yes" context="shortcut window">Open 
preferences</property>
+              </object>
+            </child>
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">true</property>