Do not pollute component directory.

--- xmlschema-4.2.0/tox.ini.orig
+++ xmlschema-4.2.0/tox.ini
@@ -3,7 +3,6 @@
 envlist = flake8, py{39,310,311,312,313,314,314-lxml, py3}, ep{48,50}, memory, docs,
     mypy-py{39,310,311,312,313,314,py3}, coverage, pytest, w3c-xsdtests
 skip_missing_interpreters = true
-work_dir = {tox_root}/../.tox/xmlschema
 
 [testenv]
 deps =