[gnome-software] Remove dead code that handles going back to the details page

[Kalev Lember <klember src gnome org>]

commit 4fa4600388dc4a32cef26f4bfa9ee4b2be7f2a6b
Author: Kalev Lember <klember redhat com>
Date:   Tue Mar 19 11:05:53 2019 +0000

    Remove dead code that handles going back to the details page
    
    We should (hopefully) never be going "back" to a details page any more
    after commit ef55f61.

 src/gs-shell.c | 7 -------
 1 file changed, 7 deletions(-)
---
diff --git a/src/gs-shell.c b/src/gs-shell.c
index 9cb8ed13..ae8c3f6d 100644
--- a/src/gs-shell.c
+++ b/src/gs-shell.c
@@ -45,7 +45,6 @@ static const gchar *page_name[] = {
 typedef struct {
        GsShellMode      mode;
        GtkWidget       *focus;
-       GsApp           *app;
        GsCategory      *category;
        gchar           *search;
 } BackEntry;
@@ -195,7 +194,6 @@ free_back_entry (BackEntry *entry)
                g_object_remove_weak_pointer (G_OBJECT (entry->focus),
                                              (gpointer *) &entry->focus);
        g_clear_object (&entry->category);
-       g_clear_object (&entry->app);
        g_free (entry->search);
        g_free (entry);
 }
@@ -479,11 +477,6 @@ gs_shell_go_back (GsShell *shell)
                         gs_category_get_id (entry->category));
                gs_shell_change_mode (shell, entry->mode, entry->category, FALSE);
                break;
-       case GS_SHELL_MODE_DETAILS:
-               g_debug ("popping back entry for %s with %p",
-                        page_name[entry->mode], entry->app);
-               gs_shell_change_mode (shell, entry->mode, entry->app, FALSE);
-               break;
        case GS_SHELL_MODE_SEARCH:
                g_debug ("popping back entry for %s with %s",
                         page_name[entry->mode], entry->search);