tests: make fixtures available via conftest.py

closes #1592

tests/test_pefile_features.py

@@ -5,11 +5,8 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the License
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
-from pathlib import PosixPath
-
 import pytest
 import fixtures
-from fixtures import scope, sample
 
 import capa.features.file