Give test a more specific name

tests/overlay-local-store/delete-refs.sh

@@ -2,4 +2,4 @@ source common.sh
 
 requireEnvironment
 setupConfig
-execUnshare ./delete-inner.sh
+execUnshare ./delete-refs-inner.sh

tests/overlay-local-store/local.mk

@@ -4,7 +4,7 @@ overlay-local-store-tests := \
   $(d)/build.sh \
   $(d)/bad-uris.sh \
   $(d)/add-lower.sh \
-  $(d)/delete.sh \
+  $(d)/delete-refs.sh \
   $(d)/gc.sh \
   $(d)/verify.sh \
   $(d)/optimise.sh