fix: Issue #1162 TESSDATA_PREFIX requires path separator at its end

[rudera-byte]

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Issue #1162

TESSDATA_PREFIX is an environment variable that points to the directory/folder containing the tessdata directory/folder. For some reason, ccextractor requires TESSDATA_PREFIX to finish with a /. It should work without one. So I added a conditional check to include a / if it is not there.

[steel-bucket]

Hi, the regression tests are all failing. Can you please rebase so we can know more.
Thanks