bug fix: recursive spack load of bake in kove tests

perf-regression/cooley/bake-kove.qsub

@@ -67,7 +67,7 @@ kdsa_manage connect mlx5_0.1/260535867639876.8:124391e4-a843-4cc8-ab28-39a93c7cc
 # benchmark executable as well for the one that was linked against this
 # backend and has it's rpath set accordingly.
 spack unload $BAKE_STABLE_VER
-spack load bake@dev-file-backend
+spack load -r bake@dev-file-backend
 
 echo "### verbs kove filesystem no threads, pipelined"
 sleep 1