[Shell32] Improper flag test in shlexec.cpp

https://github.com/reactos/reactos/blob/master/dll/win32/shell32/shlexec.cpp#L1808

The flag test accepts either SEE_MASK_IDLIST or SEE_MASK_INVOKEIDLIST

Should be:

((sei_tmp.fMask & (SEE_MASK_IDLIST | SEE_MASK_INVOKEIDLIST)) == SEE_MASK_IDLIST)

Also, the test above this, (sei_tmp.fMask & unsupportedFlags), could produce a false positive if SEE_MASK_IDLIST is set.