`WS_EX_WINDOWEDGE` not being removed when `Decorations` is false

[eythaann]

Round border is added because of this style.

Bug introduced on: #864

Currently for some reason only is removed for child windows when before was removed if not child, the correct approach was removed it if decorations are disabled, that is correct, but for ALL windows not only child windows.

I tried manually removing the style but apparently can't be removed after window creation.

let mut ex_style = WindowsApi::get_ex_styles(hwnd);
ex_style &= !WS_EX_ACCEPTFILES;
ex_style &= !WS_EX_APPWINDOW;
ex_style &= !WS_EX_WINDOWEDGE;
SetWindowLongPtrW(hwnd, GWL_EXSTYLE, ex_style.0 as isize);