winhelp: fix popup window style

[Kirill K. Smirnov]

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diff --git a/programs/winhelp/winhelp.c b/programs/winhelp/winhelp.c
index 8905d6e..c61b552 100644
--- a/programs/winhelp/winhelp.c
+++ b/programs/winhelp/winhelp.c
@@ -214,7 +214,7 @@ static HLPFILE_WINDOWINFO*     WINHELP_G
     wi.origin.x  = max(wi.origin.x, 0);
 
     wi.style = SW_SHOW;
-    wi.win_style = WS_POPUPWINDOW;
+    wi.win_style = WS_POPUP | WS_BORDER;
     wi.sr_color = wi.sr_color = 0xFFFFFF;
 
     return &wi;