[OTLayout] Minor fix for apply_lookup()

Should NOT change behavior, since first glyph is a match.

src/hb-ot-layout-gsubgpos-private.hh

@@ -840,6 +840,8 @@ static inline bool apply_lookup (hb_apply_context_t *c,
   {
     if (unlikely (c->buffer->idx == end))
       return TRACE_RETURN (true);
+
+    if (i)
       while (c->should_skip_current_glyph ())
       {
 	/* No lookup applied for this index */