HMI does not send DeleteCommand response to SDL in case delete the top level submenu

[VjKlepikov]

Description:
HMI does not send DeleteCommand response to SDL in case delete the top level submenu

Precondition:
1. SDL and HMI are started
2. Mobile device connected
3. Mobile app is registered and activated
4. SubMenu item is added
AddSubMenu("menuID":1, "menuName":"Submenu Name 1")
5. Nested submenu item are added (each submenu is nested in the previous submenu)
Send AddSubMenu(parentID=1, "menuID":2, "menuName":"Submenu Name 2")
Send AddSubMenu(parentID=2, "menuID":3, "menuName":"Submenu Name 3")
Send AddSubMenu(parentID=3, "menuID":4, "menuName":"Submenu Name 4")
6. AddCommand item is added to nested SubMenu
Send AddCommand("menuParams: { "parentID:4, "menuName":"Item to Add 1", "position":0)

Steps to reproduce:

1. Delete submenu item (item is menu-tree branch)
   Send DeleteSubMenu("menuID":4)

Expected result:
DeleteCommand requests for the requested submenu and all contents under that submenu

APP→SDL: DeleteSubMenu ( "menuID":4 )
SDL→HMI: UI.DeleteSubMenu ( params, "menuID":4)
HMI→SDL: UI.DeleteSubMenu ( resultCode = SUCCESS )
SDL→HMI: UI.DeleteCommand ( "appID":ID, "cmdID":ID )
HMI→SDL: UI.DeleteCommand ( resultCode = SUCCESS )
SDL→APP: DeleteSubMenu ( "resultCode":"SUCCESS", "success":true )
Submenu is successfully removed
"Submenu Name 4" button is not displayed on HMI

Actual result:
APP→SDL: DeleteSubMenu ( "menuID":4 )
SDL→HMI: UI.DeleteSubMenu ( params, "menuID":4)
HMI→SDL: UI.DeleteSubMenu ( resultCode = SUCCESS )
SDL→HMI: UI.DeleteCommand ( "appID":ID, "cmdID":ID )

HMI does not send response UI.DeleteCommand:
HMI→SDL: UI.DeleteCommand ( resultCode = SUCCESS )

SDL→APP: DeleteSubMenu ( "resultCode":"SUCCESS", "success":true )

Environment:
SDL: https://github.com/smartdevicelink/sdl_core/tree/develop (fcd0b38033)
HMI: https://github.com/smartdevicelink/sdl_hmi/tree/develop (6e69663)
SPT: 20210217-Android (1074)

[Ypostolov]

@jordynmackool PR with fix is ready for Livio review. Thank you.

[jacobkeeler]

Closing, Core issue (see smartdevicelink/sdl_core#3747)