PLT-1485 Adding last view channel sticky

model/preference.go

@@ -13,6 +13,9 @@ const (
 	PREFERENCE_CATEGORY_DIRECT_CHANNEL_SHOW = "direct_channel_show"
 	PREFERENCE_CATEGORY_TUTORIAL_STEPS      = "tutorial_step"
 	PREFERENCE_CATEGORY_ADVANCED_SETTINGS   = "advanced_settings"
+
+	PREFERENCE_CATEGORY_LAST     = "last"
+	PREFERENCE_NAME_LAST_CHANNEL = "channel"
 )
 
 type Preference struct {