[Tests] Remove obsolete imports from streaming maxpool test

tests/fpgadataflow/test_layer_streaming_maxpool_batch.py

@@ -38,7 +38,6 @@ from qonnx.util.basic import gen_finn_dt_tensor
 
 import finn.core.onnx_exec as oxe
 from finn.analysis.fpgadataflow.exp_cycles_per_layer import exp_cycles_per_layer
-
 from finn.transformation.fpgadataflow.compile_cppsim import CompileCppSim
 from finn.transformation.fpgadataflow.convert_to_hls_layers import InferStreamingMaxPool
 from finn.transformation.fpgadataflow.hlssynth_ip import HLSSynthIP