Fix lfpykit head model load

Author: filippomc

Dockerfile

@@ -58,7 +58,7 @@ ENV NEURON_HOME=/opt/conda
 # RUN wget -P $(pip show LFPykit | grep "Location:" | awk '{print $2"/lfpykit"}') https://www.parralab.org/nyhead/sa_nyhead.mat
 # For lpfykit 0.5
 ENV NP_LFPYKIT_HEAD_FILE=/home/jovyan/nyhead.mat
-RUN wget --no-check-certificate -P $NP_LFPYKIT_HEAD_FILE https://www.parralab.org/nyhead/sa_nyhead.mat
+RUN wget --no-check-certificate -O $NP_LFPYKIT_HEAD_FILE https://www.parralab.org/nyhead/sa_nyhead.mat
 
 USER $NB_UID