fix: set bash as prefered terminal in deadlock desktop mission base image

Dockerfile.desktop

@@ -15,6 +15,7 @@ RUN addgroup -S sudo && adduser --disabled-password --gecos '' deadlock && \
 
 RUN chown root:docker /usr/local/bin/docker
 
+RUN sed -e '$s/ash/bash/' /etc/passwd
 
 COPY start.desktop.sh .
 RUN chmod 500 start.desktop.sh