PGS and DVB subtitles: Fix missing subtitles after resizing the window.

When using the subpicture queue along with PGS and DVB subtitles, some subtitles were missing after the window was resized.
cosmetics
VSFilter: move the AboutDlg version to a new define and use that
AboutDlg.cpp: use the MPC_VERSION_ARCH define
Reduce variable scope.
remove unneeded variable
Using a precommit script seems like speaking Chinese for some.