Remove redundant CIDs from GSUB vkna

If the GSUB `vkna` substitution is used together
with the GSUB `vert` substitution, CID+16236-CID+16252 in `vkna`
are not used because they are substituted to other CIDs by `vert`.

This commit removes them.

GSUB/aj17-gsub-jp04.fea

@@ -20692,23 +20692,6 @@ feature vkna {
   substitute \16219 by \16392;
   substitute \16220 by \16393;
   substitute \16221 by \16394;
-  substitute \16236 by \16395;
-  substitute \16237 by \16396;
-  substitute \16238 by \16397;
-  substitute \16239 by \16398;
-  substitute \16240 by \16399;
-  substitute \16241 by \16400;
-  substitute \16242 by \16401;
-  substitute \16243 by \16402;
-  substitute \16244 by \16403;
-  substitute \16245 by \16404;
-  substitute \16246 by \16405;
-  substitute \16247 by \16406;
-  substitute \16248 by \16407;
-  substitute \16249 by \16408;
-  substitute \16250 by \16409;
-  substitute \16251 by \16410;
-  substitute \16252 by \16411;
   substitute \16333 by \16395;
   substitute \16334 by \16396;
   substitute \16335 by \16397;

GSUB/aj17-gsub.fea

@@ -20428,23 +20428,6 @@ feature vkna {
   substitute \16219 by \16392;
   substitute \16220 by \16393;
   substitute \16221 by \16394;
-  substitute \16236 by \16395;
-  substitute \16237 by \16396;
-  substitute \16238 by \16397;
-  substitute \16239 by \16398;
-  substitute \16240 by \16399;
-  substitute \16241 by \16400;
-  substitute \16242 by \16401;
-  substitute \16243 by \16402;
-  substitute \16244 by \16403;
-  substitute \16245 by \16404;
-  substitute \16246 by \16405;
-  substitute \16247 by \16406;
-  substitute \16248 by \16407;
-  substitute \16249 by \16408;
-  substitute \16250 by \16409;
-  substitute \16251 by \16410;
-  substitute \16252 by \16411;
   substitute \16333 by \16395;
   substitute \16334 by \16396;
   substitute \16335 by \16397;