[subset-cff] Readjust parsed_cs_op_t

Now it doesn't matter anymore since op_str_t is adjusted and
is 16 bytes with 8byte alignment.

src/hb-subset-cff-common.hh

@@ -309,7 +309,7 @@ struct parsed_cs_op_t : op_str_t
   bool for_skip () const { return skip_flag; }
   void set_skip ()       { skip_flag = true; }
 
-  uint16_t subr_num;
+  unsigned subr_num;
 
   protected:
   bool	  drop_flag : 1;