Fix memory_usage schema for staticman meta.yml
Fix memory_usage schema for staticman meta.yml

Address #367

Fix the memory_usage schema when using staticman to generate the
meta.yml.

usnistgov/chimad-phase-field,wd15/chimad-phase-field,wd15/chimad-phase-field,usnistgov/chimad-phase-field,wd15/chimad-phase-field,usnistgov/chimad-phase-field