Fixing a minor bug in a test (#8223)

### Description

There is a minor bug in a test which causes a second fail to occur when
one does. In `test_module_list.py`, there is a list of classes to check
which must have aliases removed from it. This must be done before the
test assert so that in the event the assert fails this removal isn't
skipped.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Eric Kerfoot <eric.kerfoot@kcl.ac.uk>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: ericspod

tests/test_module_list.py

@@ -58,13 +58,17 @@ def test_transform_api(self):
                 continue
             with self.subTest(n=n):
                 basename = n[:-1]  # Transformd basename is Transform
+
+                # remove aliases to check, do this before the assert below so that a failed assert does skip this
+                for postfix in ("D", "d", "Dict"):
+                    remained.remove(f"{basename}{postfix}")
+
                 for docname in (f"{basename}", f"{basename}d"):
                     if docname in to_exclude_docs:
                         continue
                     if (contents is not None) and f"`{docname}`" not in f"{contents}":
                         self.assertTrue(False, f"please add `{docname}` to docs/source/transforms.rst")
-                for postfix in ("D", "d", "Dict"):
-                    remained.remove(f"{basename}{postfix}")
+
         self.assertFalse(remained)