tests: correct Windows output to account for putting repos in `repo` subdir

These were missed in 55c6ebd11cb9, due to being conditionalized and not running
in CI.

tests/test-audit-path.t

@@ -114,7 +114,7 attack back/test where back symlinks to
 #else
 ('back' will be a file and cause some other system specific error)
   $ hg update -Cr2
-  abort: $TESTTMP/target/back/test: $ENOTDIR$
+  abort: $TESTTMP/repo/target/back/test: $ENOTDIR$
   [255]
 #endif