Python: Accept .exepcted changes from importing frameworks from data-flow

Since `python.qll` has `private import
semmle.python.dataflow.new.DataFlow`, that means that all tests now
implicitly imports the frameworks modeling, and therefore any python
class is part of the DjangoViewClassHelper ql class.

https://github.com/github/codeql/blob/de8ecb214f4c2dcd0c0223f19d7eff7b2ee430e5/python/ql/lib/python.qll#L44

Author: RasmusWL

python/ql/test/2/library-tests/locations/general/Locations.expected

@@ -55,6 +55,7 @@
 | Dict | 46 | 54 | 46 | 55 |
 | Dict | 48 | 9 | 48 | 19 |
 | DictUnpacking | 46 | 52 | 46 | 55 |
+| DjangoViewClassHelper | 4 | 1 | 4 | 8 |
 | Ellipsis | 7 | 7 | 7 | 9 |
 | Ellipsis | 50 | 14 | 50 | 16 |
 | ExceptStmt | 32 | 9 | 32 | 31 |

python/ql/test/3/library-tests/locations/general/Locations.expected

@@ -44,6 +44,7 @@
 | Dict | 46 | 54 | 46 | 55 |
 | Dict | 48 | 9 | 48 | 19 |
 | DictUnpacking | 46 | 52 | 46 | 55 |
+| DjangoViewClassHelper | 4 | 1 | 4 | 8 |
 | Ellipsis | 7 | 7 | 7 | 9 |
 | Ellipsis | 50 | 14 | 50 | 16 |
 | ExceptStmt | 32 | 9 | 32 | 31 |