[aat] Correct array indexing when looking up actions in KerxSubTableFormat4 (#2539) * [aat] Correct array indexing when looking up actions in KerxSubTableFormat4. - For action_type 0 and 1, there are 2 values per action record; for action_type 2, there are 4. So we need to account for these factors when indexing into the ankrData array. Fixes https://github.com/harfbuzz/harfbuzz/issues/2531.
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