PortableApps: ensure that the personal folder is set to the App directory

Otherwise the portable version ends up loading the user local personal profile

Change-Id: Ib670c065319b0dd9673f239ae9459f6ee530f69e
Reviewed-on: https://code.wireshark.org/review/5351
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
Tested-by: Pascal Quantin <pascal.quantin@gmail.com>
Reviewed-by: Evan Huus <eapache@gmail.com>