[PATCH v5 2/2] user32:Fix z order error when WS_CHILD window want to be topmost windows.

[cuijiajin]

window with WS_CHILD does not need to change Z order when SetWindowPos param hwndInsertAfter is HWND_TOPMOST or HWND_NOTOPMOST.	Solve the problems mentioned in the previous patch, and Remove todo_wine on test_child_topmost_zorder.

v2：
Add git log information
v3:
Move the path to fixup_flags function, only used to fix SetWindowPos function problem.
v4:
Divide a path into two pathes, better explain the prolem. and add notopmost verification
v5:
Add todo_wine to test patch[patch v5 1/2], and optimize fixup_flags[patch v5 2/2]. 

Signed-off-by: cuijiajin <cuijiajin(a)uniontech.com>