package:win32: allow Play With/Add to Playlist on more than 15 elements

see https://msdn.microsoft.com/en-us/library/windows/desktop/cc144171%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/package/win32/NSIS/helpers/extensions.nsh

@@ -245,9 +245,11 @@ FunctionEnd
 ; Generic function for adding the context menu for one ext.
 !macro AddContextMenuExt EXT
   WriteRegStr HKCR ${EXT}\shell\PlayWithVLC "" $ContextMenuEntry_PlayWith
+  WriteRegStr HKCR ${EXT}\shell\PlayWithVLC "MultiSelectModel" "Player"
   WriteRegStr HKCR ${EXT}\shell\PlayWithVLC\command "" '"$INSTDIR\vlc.exe" --started-from-file --no-playlist-enqueue "%1"'
 
   WriteRegStr HKCR ${EXT}\shell\AddToPlaylistVLC "" $ContextMenuEntry_AddToPlaylist
+  WriteRegStr HKCR ${EXT}\shell\AddToPlaylistVLC "MultiSelectModel" "Player"
   WriteRegStr HKCR ${EXT}\shell\AddToPlaylistVLC\command "" '"$INSTDIR\vlc.exe" --started-from-file --playlist-enqueue "%1"'
 !macroend