tox: package = editable-legacy, fixes #7580

tox.ini

@@ -10,7 +10,7 @@ requires =
 	wheel
 	setuptools_scm
 [testenv]
-package = editable  # without this it does not find setup_docs when running under fakeroot
+package = editable-legacy  # without this it does not find setup_docs when running under fakeroot
 setenv =
    fuse2: BORG_FUSE_IMPL=llfuse
    fuse3: BORG_FUSE_IMPL=pyfuse3