[docker] Remove dumpport file copy

Author: JakubVanek

build/Dockerfile.scripts

@@ -3,7 +3,6 @@ FROM ev3dev-lang-java:jdk10-stretch
 # copy build patches & scripts
 COPY *.patch *.sh /opt/jdkcross/
 RUN chmod +x /opt/jdkcross/*.sh && mkdir /opt/jdkcross/jshellhack
-COPY DumpPort.java /opt/jdkcross/jshellhack/
 
 # this directory should be mounted
 VOLUME /build