[cpackget] extract license file fails if the location is in a subdirectory of the pack

[jkrech]

Describe the bug
cpackget V2.0.0

When the <license> references a file in a sub-directory of the pack, the license is not extracted correctly

To Reproduce
Steps to reproduce the behavior:

1. Run the cpackget: cpackget add TexasInstruments::MSPM0L11XX_L13XX_DFP
2. When asked to [A]ccpet [C]ancle or [E]xtract choose E
3. See error

I: Extracting embedded license to C:\Users\jkrech\AppData\Local\Arm\Packs\.Download\TexasInstruments.MSPM0L11XX_L13XX_DFP.1.2.1.pack.01_Pack\license.txt
E: open C:\Users\jkrech\AppData\Local\Arm\Packs\.Download\TexasInstruments.MSPM0L11XX_L13XX_DFP.1.2.1.pack.01_Pack\license.txt: The system cannot find the path specified.

NOTE: I the user accepts the license, the license file is currently not stored at all and wrong path to the license file is provided to invoking tools (e.g. MDK PackInstaller). While the cpackget CLI installation completes successfully without the license being stored, an integrating tool cannot find nor display the license and the pack cannot be installed successfully.

Expected behavior
The license file shall be stored regardless or pack location in a file named:

C:\Users\jkrech\AppData\Local\Arm\Packs\.Download\TexasInstruments.MSPM0L11XX_L13XX_DFP.1.2.1.pack.lic.txt
$CMSIS_PACK_ROOT/.Download/<vendor>.<name>.<version>.pack.lic.<ext>

Environment:

• OS: all
• Version Win10