Changes data type of offline LFP to float32 (like the rest)

code/convert_to_nix.py

@@ -103,7 +103,7 @@ if filtered_anasig is None:
         # first run? Create a new Analogsignal
         if f == 0:
             offline_filtered_anasig = neo.AnalogSignal(
-                np.zeros((downsampled_signal.shape[0], raw_anasig.shape[1])) *\
+                np.zeros((downsampled_signal.shape[0], raw_anasig.shape[1]), dtype=np.float32) *\
                     downsampled_signal.units,
                 t_start=downsampled_signal.t_start,
                 sampling_rate=downsampled_signal.sampling_rate)