Update torch.py

[LukasMut]

• changed order of flatten activations vs. token extraction in PyTorch extractor -> we first want to check whether token extraction is selected and then whether the activations should be flattened into a vector rep
• this will omit problems caused by setting both args

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 74.44%. Comparing base (4507cae) to head (b44a373).

:exclamation: Current head b44a373 differs from pull request most recent head 563a15e. Consider uploading reports for the commit 563a15e to get more accurate results

Files	Patch %	Lines
thingsvision/core/extraction/torch.py	20.00%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #171 +/- ## ======================================= Coverage 74.44% 74.44% ======================================= Files 36 36 Lines 1851 1851 Branches 247 247 ======================================= Hits 1378 1378 Misses 396 396 Partials 77 77 ``` | [Flag](https://app.codecov.io/gh/ViCCo-Group/thingsvision/pull/171/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ViCCo-Group/thingsvision/pull/171/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group) | `74.44% <20.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ViCCo-Group#carryforward-flags-in-the-pull-request-comment) to find out more.

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