[epiphany] Added ctrl-tab and ctrl-shift-tab to the (in-gui) list of keybindings

[Michael Catanzaro <mcatanzaro src gnome org>]

commit daf5a26428af32f91a4dcf526a14308455baedb0
Author: Antoine Fontaine <antoine fontaine epfl ch>
Date:   Sun Jun 23 14:37:23 2019 +0200

    Added ctrl-tab and ctrl-shift-tab to the (in-gui) list of keybindings
    
    see https://gitlab.gnome.org/GNOME/epiphany/issues/771

 src/resources/gtk/shortcuts-dialog.ui | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/resources/gtk/shortcuts-dialog.ui b/src/resources/gtk/shortcuts-dialog.ui
index 469142c1e..57051fbf4 100644
--- a/src/resources/gtk/shortcuts-dialog.ui
+++ b/src/resources/gtk/shortcuts-dialog.ui
@@ -166,14 +166,14 @@
               <object class="GtkShortcutsShortcut">
                 <property name="visible">True</property>
                 <property name="title" translatable="yes" context="shortcut window">Go to the next 
tab</property>
-                <property name="accelerator">&lt;Primary&gt;Page_Down</property>
+                <property name="accelerator">&lt;Primary&gt;Page_Down &lt;Primary&gt;Tab</property>
               </object>
             </child>
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">True</property>
                 <property name="title" translatable="yes" context="shortcut window">Go to the previous 
tab</property>
-                <property name="accelerator">&lt;Primary&gt;Page_Up</property>
+                <property name="accelerator">&lt;Primary&gt;Page_Up 
&lt;shift&gt;&lt;Primary&gt;Tab</property>
               </object>
             </child>
             <child>