Access2Base correct behaviour of SelectObject on Linux

( toFront on top of setFocus )

Change-Id: If8184af5f879e2391136f4a265439f0207f6af27
Reviewed-on: https://gerrit.libreoffice.org/6986
Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>