Update test/src/meshgenerators/StitchedSubgenerators.C
Update test/src/meshgenerators/StitchedSubgenerators.C

Make subgenerator name base unique

Co-authored-by: Logan Harbour <5e4f14c6ecc988d6c96b41b909ba6662bd5cbfac@gmail.com>
milljm/moose,milljm/moose,sapitts/moose,andrsd/moose,andrsd/moose,lindsayad/moose,laagesen/moose,idaholab/moose,SudiptaBiswas/moose,milljm/moose,andrsd/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,harterj/moose,andrsd/moose,idaholab/moose,bwspenc/moose,bwspenc/moose,laagesen/moose,idaholab/moose,bwspenc/moose,sapitts/moose,sapitts/moose,andrsd/moose,lindsayad/moose,dschwen/moose,laagesen/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,dschwen/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,idaholab/moose,jessecarterMOOSE/moose,lindsayad/moose,sapitts/moose,harterj/moose,harterj/moose,laagesen/moose,idaholab/moose,bwspenc/moose,SudiptaBiswas/moose,milljm/moose,SudiptaBiswas/moose,dschwen/moose,bwspenc/moose,SudiptaBiswas/moose,lindsayad/moose,harterj/moose,milljm/moose,lindsayad/moose,dschwen/moose,laagesen/moose,sapitts/moose,dschwen/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,nuclear-wizard/moose,harterj/moose