[libdazzle] dock-bin: fix direction alias

[Christian Hergert <chergert src gnome org>]

commit 04453379e1365a1bcef5a0a6c2f33f1a6eb83533
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 6 14:40:21 2018 -0700

    dock-bin: fix direction alias
    
    These were flipped.

 src/panel/dzl-dock-bin.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/panel/dzl-dock-bin.c b/src/panel/dzl-dock-bin.c
index 2f0009e..b04d8d4 100644
--- a/src/panel/dzl-dock-bin.c
+++ b/src/panel/dzl-dock-bin.c
@@ -415,7 +415,7 @@ dzl_dock_bin_focus (GtkWidget        *widget,
     {
       switch (dir)
         {
-        case GTK_DIR_TAB_FORWARD:
+        case GTK_DIR_TAB_BACKWARD:
         case GTK_DIR_LEFT:
           if (child->type == DZL_DOCK_BIN_CHILD_CENTER)
             next_child = dzl_dock_bin_get_child_typed (self, DZL_DOCK_BIN_CHILD_LEFT);
@@ -423,7 +423,7 @@ dzl_dock_bin_focus (GtkWidget        *widget,
             next_child = dzl_dock_bin_get_child_typed (self, DZL_DOCK_BIN_CHILD_CENTER);
           break;
 
-        case GTK_DIR_TAB_BACKWARD:
+        case GTK_DIR_TAB_FORWARD:
         case GTK_DIR_RIGHT:
           if (child->type == DZL_DOCK_BIN_CHILD_LEFT)
             next_child = dzl_dock_bin_get_child_typed (self, DZL_DOCK_BIN_CHILD_CENTER);