Remove ttconv backwards-compatibility code #30145
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PR summary
When ttconv was replaced by pure Python code, several bits of compatibility code were left in in #18181. This removes those code chunks, as the test images will already be regenerated as part of the larger font work.
As this only affects PDF, and it's only minor rounding/duplicate vertices, the differences are generally only a single pixel for 1 character out of 3 or 4.
PR checklist