pybind/mgr: sort and fix indent in modules list in mypy env

In the tox.ini file the modules validated by mypy are explicitly listed.
Fix one item which was indented differently than the others.
Sort the list.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

src/pybind/mgr/tox.ini

@@ -103,10 +103,10 @@ commands =
            -m progress \
            -m prometheus \
            -m rbd_support \
-	   -m rgw \
+           -m rgw \
            -m rook \
-           -m snap_schedule \
            -m selftest \
+           -m snap_schedule \
            -m stats \
            -m status \
            -m telegraf \