user32: only try to remove the document icon from the frame menu when needed

[Peter Oberndorfer]

previously MDI_RestoreFrameMenu would be called on every WM_SIZE message,
which does not maximize the window.
But this function removes the leftmost menu entry of the frame menu so it only must be called,
when switching from maximized to restored, or menu entries will disappear

this should fix http://bugs.winehq.org/show_bug.cgi?id=7190

Changelog:
user32: only try to remove the document icon from the frame menu when needed


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