Remove the bytes default for get_kv_table_rows_params.encode_type.

plugins/chain_plugin/include/eosio/chain_plugin/chain_plugin.hpp

@@ -352,7 +352,7 @@ class read_only {
         name                   code;                  // name of contract
         name                   table;                 // name of kv table,
         name                   index_name;            // name of index index
-        string                 encode_type = "bytes"; // "bytes" : binary values in index_value/lower_bound/upper_bound
+        string                 encode_type;           // encoded type for values in index_value/lower_bound/upper_bound
         string                 index_value;           // index value for point query.  If this is set, it is processed as a point query
         string                 lower_bound;           // lower bound value of index of index_name. If index_value is not set and lower_bound is not set, return from the beginning of range in the prefix
         string                 upper_bound;           // upper bound value of index of index_name, If index_value is not set and upper_bound is not set, It is set to the beginning of the next prefix range.