libraries-override not working
You can override a library using the filename as key.

libraries-override:
  system/base:
    css:
      component:
        css/components/align.module.css: false



But if your asset was already overwritten by another module (e.g. classy theme overriding a core system asset), you have to use the full path instead, example:

libraries-override:
  system/base:
    css:
      component:
        /core/themes/stable/css/system/components/ajax-progress.module.css: false


Also see this issue.