fix bug on user select screen preventing the back button from working

components/data/SceneManager.brs

@@ -1,4 +1,6 @@
 import "pkg:/source/roku_modules/log/LogMixin.brs"
+import "pkg:/source/utils/config.brs"
+import "pkg:/source/utils/session.bs"
 
 sub init()
     m.log = log.Logger("SceneManager")
@@ -77,16 +79,22 @@ end sub
 sub popScene()
     group = m.groups.pop()
     if group <> invalid
-        if group.isSubType("JFGroup")
+        groupType = group.subtype()
+        if groupType = "JFGroup"
             unregisterOverhangData(group)
-        else if group.isSubType("JFVideo")
+        else if groupType = "JFVideo"
             ' Stop video to make sure app communicates stop playstate to server
             group.control = "stop"
+        else if groupType = "UserSelect"
+            ' user pressed back on the UserSelect screen and wants to select a server
+            ' wipe the current server session data
+            session.server.Delete()
+            unset_setting("server")
         end if
 
         group.visible = false
 
-        if group.isSubType("JFScreen")
+        if groupType = "JFScreen"
             group.callFunc("OnScreenHidden")
         end if
     else