Remove unneeded script parameters in test_cpp_memcheck.sh (#15158)

Fixes error introduced in #14992 in `test_cpp_memcheck.sh`
Extra line of parameters removed from the call to `run_cudf_memcheck_ctests.sh`

Authors:
  - David Wendt (https://github.com/davidwendt)
  - https://github.com/jakirkham

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Vyas Ramasubramani (https://github.com/vyasr)
  - Ray Douglass (https://github.com/raydouglass)

URL: #15158

ci/test_cpp_memcheck.sh

@@ -8,9 +8,7 @@ source ./ci/test_cpp_common.sh
 
 rapids-logger "Memcheck gtests with rmm_mode=cuda"
 
-./ci/run_cudf_memcheck_ctests.sh \
-    --gtest_output=xml:"${RAPIDS_TESTS_DIR}${test_name}.xml" \
- && EXITCODE=$? || EXITCODE=$?;
+./ci/run_cudf_memcheck_ctests.sh && EXITCODE=$? || EXITCODE=$?;
 
 rapids-logger "Test script exiting with value: $EXITCODE"
 exit ${EXITCODE}