emulators/rpcs3: unbreak build after 953b849066b7

In file included from rpcs3/Emu/Cell/lv2/sys_net.cpp:34:
In file included from rpcs3/Emu/NP/np_handler.h:11:
In file included from rpcs3/Emu/NP/rpcn_client.h:29:
rpcs3/Emu/NP/generated/np2_structs_generated.h:128:12: error: no matching member function for call to 'VerifyField'

VerifyField<uint16_t>(verifier, VT_ID, 2) &&
^~~~~~~~~~~~~~~~~~~~~

rpcs3/Emu/NP/generated/np2_structs_generated.h:192:12: error: no matching member function for call to 'VerifyField'

VerifyField<uint32_t>(verifier, VT_NUM, 4) &&
^~~~~~~~~~~~~~~~~~~~~

rpcs3/Emu/NP/generated/np2_structs_generated.h:242:12: error: no matching member function for call to 'VerifyField'

VerifyField<uint64_t>(verifier, VT_UPDATEDATE, 8) &&
^~~~~~~~~~~~~~~~~~~~~

rpcs3/Emu/NP/generated/np2_structs_generated.h:360:12: error: no matching member function for call to 'VerifyField'

VerifyField<uint8_t>(verifier, VT_TYPE, 1) &&
^~~~~~~~~~~~~~~~~~~~

[...]
/usr/local/include/flatbuffers/table.h:115:8: note: candidate function template not viable: requires 2 arguments, but 3 were provided

bool VerifyField(const Verifier &verifier, voffset_t field) const {
     ^

PR: 263552