remove final tests count for now

Author: hjwp

chapter_19_mocking.asciidoc

@@ -2145,12 +2145,12 @@ $ pass:quotes[*python src/manage.py test functional_tests.test_login*]
 OK
 $ pass:quotes[*cd src && python manage.py test*]
 [...]
-Ran 57 tests in 78.124s
 
 OK
 ----
 //54
 
+// TODO: Ran 57 tests in 78.124s
 
 WARNING: We're nowhere near a truly secure or acceptable login system here.
     Since this is just an example app for a book, we'll leave it at that,