Fix tiff2pdf problem of converting tiff to pdf using COMPRESSION_JPEG format.

Fix tiff2pdf problem of converting from tiff (using COMPRESSION_JPEG format) to pdf.

I'm not good at JPEG and DCT things. So please review deeply as needed.

Test cases:

marb.tif

Note: tiff2pdf.exe is: LIBTIFF, Version 4.2.0

• Input: marb.tif
• Output: marb.pdf (broken?)

KU@H270 /cygdrive/c/a
$ tiff2pdf.exe -o marb.pdf marb.tif

• Fixed output by this PR: marb.pdf

24.tif

Note: tiff2pdf.exe is: LIBTIFF, Version 4.2.0

• Input: 24.tif
• Output: 24.pdf (broken?)

KU@H270 /cygdrive/c/a/c2
$ tiff2pdf.exe -o 24.pdf 24.tif

• Fixed output by this PR: 24.pdf