remove extra --generate-allowlist (#1576)

* remove extra `--generate-allowlist`

* Update stubtest.sh

* Update allowlist_todo.txt

* Update stubtest.sh

Author: sobolevn

scripts/stubtest.sh

@@ -11,5 +11,4 @@ stubtest django \
     --mypy-config-file mypy.ini \
     --ignore-positional-only \
     --allowlist scripts/stubtest/allowlist.txt \
-    --allowlist scripts/stubtest/allowlist_todo.txt \
-    --generate-allowlist
+    --allowlist scripts/stubtest/allowlist_todo.txt