Removed the following files from flake8 test whitelist:

- `sandbox/tests/test_theano_object.py` - `sandbox/tests/test_scan.py`

Removed the following files from flake8 test whitelist:
ca67cc76 · Shawn Tan · fcbb3e9b · ca67cc76
--- a/theano/tests/test_flake8.py
+++ b/theano/tests/test_flake8.py
@@ -73,8 +73,6 @@ whitelist_flake8 = [
    "scalar/__init__.py",
    "scalar/tests/__init__.py",
    "sandbox/__init__.py",
-    "sandbox/tests/test_theano_object.py",
-    "sandbox/tests/test_scan.py",
    "sandbox/tests/__init__.py",
    "sandbox/cuda/__init__.py",
    "sandbox/cuda/tests/__init__.py",