Fix OS/2.usMaxContext for reverse GSUB rules #3569
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This PR fixes
maxCtxContextualRule, which was returning too high results for reverse chaining contextual single substitutions. ItsGlyphCountfield is the number of glyphs in the coverage table, not the number of glyphs in the input sequence. The input sequence is always 1 glyph long because it is a reverse chaining contextual single substitution.