Bug 1599928 - Fix a tier-2 Python linting failure. r=erahm

It's complaining about `milestone` not being used.

Differential Revision: https://phabricator.services.mozilla.com/D55059

--HG--
extra : moz-landing-system : lando

build/moz.configure/memory.configure

@@ -51,9 +51,9 @@ set_config('MOZ_REPLACE_MALLOC_STATIC', replace_malloc_static)
 
 # In general, it only makes sense for PHC to run on the platforms that have a
 # crash reporter.
-@depends(milestone, target, replace_malloc_default, '--enable-replace-malloc',
+@depends(target, replace_malloc_default, '--enable-replace-malloc',
          when='--enable-jemalloc')
-def phc_default(milestone, target, replace_malloc_default, replace_malloc):
+def phc_default(target, replace_malloc_default, replace_malloc):
     if not replace_malloc_default or \
        (replace_malloc.origin != 'default' and not replace_malloc):
         return False