shell32: Fix some bugs of IShellLink

### shell32_winetest shelllink before patch ###

shelllink.c:179: Test failed: GetPath failed (0x00000000)

shelllink.c:199: Test failed: GetIDList failed (0x00000001)

shelllink.c:242: Test failed: GetPath returned 'C:\nonexistent\file'

shelllink.c:319: Test failed: GetIconLocation failed (0x80070002)

shelllink.c:692: Test failed: GetPath returned 'C:\ReactOS\bin\shell32_winetest' instead of 'C:\ReactOS\bin\shell32_winetest.exe'

shelllink.c:724: Test failed: GetPath returned 'C:\ReactOS\rundll32' instead of 'C:\ReactOS\system32\rundll32.exe'

shelllink.c:803: Test failed: GetPath returned 'C:\Documents and Settings\Administrator\Local Settings\Temp\test' instead of 'C:\Documents and Settings\Administrator\Local Settings\Temp\test.bat'

shelllink.c:963: Test failed: GetIconLocation failed (0x80070002)

shelllink.c:977: Test failed: GetIconLocation failed (0x80070002)

shelllink: 421 tests executed (0 marked as todo, 9 failures), 0 skipped.

### shell32_winetest shelllink after patch ###

shelllink.c:206: Test failed: SHGetPathFromIDListA failed

shelllink.c:319: Test failed: GetIconLocation failed (0x80004005)

shelllink.c:963: Test failed: GetIconLocation failed (0x80004005)

shelllink.c:977: Test failed: GetIconLocation failed (0x80004003)

shelllink: 422 tests executed (0 marked as todo, 4 failures), 0 skipped.