Update tox.ini

Author: manthey

tox.ini

@@ -20,7 +20,7 @@ whitelist_externals =
   rm
   npx
 commands =
-  rm -rf .tox/test/coverage/web_temp
+  rm -rf build/test/coverage/web_temp
   girder build --dev
   pytest --numprocesses {env:PYTEST_NUMPROCESSES:logical} --cov {envsitepackagesdir}/histomicsui {posargs}
   npx nyc report --temp-dir build/test/coverage/web_temp --report-dir .tox/coverage --reporter cobertura --reporter text-summary