Remove qemu package from dockerfile

The metapackage has been moved to universe and is hence.

Author: jcjgraf

tools/docker/Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:latest
 
 # build dependencies
 RUN apt-get update -y
-RUN apt-get install -y build-essential clang make xorriso qemu-utils qemu qemu-system-x86 patch
+RUN apt-get install -y build-essential clang make xorriso qemu-utils qemu-system-x86 patch
 # grub is a bit special in containers
 RUN DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install grub2 kmod python3