scripted-diff: adapt script error constant names in feature_taproot.py

In order to remove potential confusion, this commit adapts all script
error constant names in the functional tests (currently only in
feature_taproot.py) to the ones used in our C++ codebase. This also
makes checking whether we have test coverage for a certain script error
easier.

-BEGIN VERIFY SCRIPT-

ren() { sed -i "s|$1|$2|g" $( git grep -l "$1" -- "./test" ) ; }

ren ERR_SIG_SIZE          ERR_SCHNORR_SIG_SIZE
ren ERR_SIG_HASHTYPE      ERR_SCHNORR_SIG_HASHTYPE
ren ERR_SIG_SCHNORR       ERR_SCHNORR_SIG
ren ERR_CONTROLBLOCK_SIZE ERR_TAPROOT_WRONG_CONTROL_SIZE
ren ERR_PUSH_LIMIT        ERR_PUSH_SIZE
ren ERR_MINIMALIF         ERR_TAPSCRIPT_MINIMALIF
ren ERR_UNKNOWN_PUBKEY    ERR_PUBKEYTYPE
ren ERR_STACK_EMPTY       ERR_INVALID_STACK_OPERATION
ren ERR_SIGOPS_RATIO      ERR_TAPSCRIPT_VALIDATION_WEIGHT
ren ERR_UNDECODABLE       ERR_BAD_OPCODE
ren ERR_NO_SUCCESS        ERR_EVAL_FALSE
ren ERR_EMPTY_WITNESS     ERR_WITNESS_PROGRAM_WITNESS_EMPTY

-END VERIFY SCRIPT-

Author: theStack