Fix tab/space

Author: pvizeli

Dockerfile.dev

@@ -2,7 +2,7 @@ FROM python:3.8
 
 RUN \
     && apt-get update && apt-get install -y --no-install-recommends \
-		software-properties-common \
+        software-properties-common \
     && add-apt-repository ppa:jonathonf/ffmpeg-4 \
     && apt-get update && apt-get install -y --no-install-recommends \
         libudev-dev \