fix build with EOSIO_COMPILE_TEST_CONTRACTS and cdt 4.1

[spoonincode]

This EOSIO_DISPATCH was causing a build failure,

/spring/unittests/contracts/eosio.system/eosio.system.cpp:313:29: error: use of undeclared identifier 'sellram'
      (buyrambytes)(buyram)(sellram)(delegatebw)(undelegatebw)(refund)
                            ^
/spring/unittests/contracts/eosio.system/eosio.system.cpp:304:1: error: no member named 'BLUEGRASS_META_SEQ_ENUM_BLUEGRASS_META_SEQ_SIZE_BLUEGRASS_META_SEQ_SIZE_33' in 'eosiosystem::system_contract'
EOSIO_DISPATCH( eosiosystem::system_contract,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/opt/cdt/4.1.0/bin/../include/eosiolib/contracts/eosio/dispatcher.hpp:126:13: note: expanded from macro 'EOSIO_DISPATCH'
            EOSIO_DISPATCH_HELPER( TYPE, MEMBERS ) \
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/opt/cdt/4.1.0/bin/../include/eosiolib/contracts/eosio/dispatcher.hpp:103:5: note: expanded from macro 'EOSIO_DISPATCH_HELPER'
    BLUEGRASS_META_FOREACH_SEQ( EOSIO_DISPATCH_INTERNAL, TYPE, MEMBERS )
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/opt/cdt/4.1.0/bin/../include/bluegrass/meta/preprocessor.hpp:196:125: note: expanded from macro 'BLUEGRASS_META_FOREACH_SEQ'
   BLUEGRASS_META_EXPAND(BLUEGRASS_META_EXPAND(BLUEGRASS_META_GET_NTH_ARG BLUEGRASS_META_GET_NTH_ARG_SEQ_ARGS(__VA_ARGS__)) BLUEGRASS_META_FOREACH_SEQ_ARGS(MAC, D, ##__VA_ARGS__))
   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: (skipping 7 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
/usr/opt/cdt/4.1.0/bin/../include/bluegrass/meta/preprocessor.hpp:122:47: note: expanded from macro 'BLUEGRASS_META_FE1'
#define BLUEGRASS_META_FE1(MAC,  A, B) MAC(A, B)
                                              ^
/usr/opt/cdt/4.1.0/bin/../include/eosiolib/contracts/eosio/dispatcher.hpp:98:78: note: expanded from macro 'EOSIO_DISPATCH_INTERNAL'
       eosio::execute_action( eosio::name(receiver), eosio::name(code), &OP::elem ); \
                                                                             ^
/usr/opt/cdt/4.1.0/bin/../include/bluegrass/meta/preprocessor.hpp:10:36: note: expanded from macro 'BLUEGRASS_META_EXPAND_I'
#define BLUEGRASS_META_EXPAND_I(x) x

(and more similar errors)

I can't see any reason to use EOSIO_DISPATCH? So just remove it. This allows building EOSIO_COMPILE_TEST_CONTRACTS with cdt 4.1. I at least passed unit_test locally so let's see how this goes...

I am hesitant to touch #677; I don't see the same errors locally (like in eosio.mechanics) so maybe there is some other issue? idk maybe someone else chime in and/or try themselves to see if we should close out #677

[spoonincode]

okay after some discussion will consider this closing #677; I hadn't noticed 677 had been partially worked already so this probably just resolved the final lingering issue.