Fix copy and paste error for build name in tribits_ctest_driver() test (

TriBITSPub#278)

This was created by commit:

  49d9c81 "tribits_ctest_driver(): Use more robust and better git commands and stronger testing (TriBITSPub#278, TRIL-260)"
  Author: Roscoe A. Bartlett <rabartl@sandia.gov>
  Date:   Thu Feb 14 13:42:11 2019 -0700

  A       test/ctest_driver/TribitsExampleMetaProject/CMakeLists.txt

test/ctest_driver/TribitsExampleMetaProject/CMakeLists.txt

@@ -453,7 +453,7 @@ tribits_add_advanced_test( CTestDriver_TribitsExMetaProj_clone_custom_branch_rem
       TribitsExMetaProj_ENABLE_SECONDARY_TESTED_CODE=TRUE
       TribitsExMetaProj_GIT_REPOSITORY_REMOTE=github
       TribitsExMetaProj_BRANCH=for-testing
-      CTEST_BUILD_NAME=CTestDriver_TribitsExMetaProj_clone_default_branch_remote
+      CTEST_BUILD_NAME=CTestDriver_TribitsExMetaProj_clone_custom_branch_remote
       ${CTEST_S_SCRIPT_ARGS}
     PASS_REGULAR_EXPRESSION_ALL
       "-- ENV_TribitsExMetaProj_BRANCH='for-testing'"