CI: add missing line continuation marker

Resolves this docker warning:

```
[WARNING]: Empty continuation line found in:
    RUN apt-get update && apt-get install -y --no-install-recommends   g++   gcc-multilib   make   ninja-build   file   curl   ca-certificates   python2.7   python3.9   git   cmake   sudo   gdb   llvm-13-tools   llvm-13-dev   libedit-dev   libssl-dev   pkg-config   zlib1g-dev   xz-utils   nodejs     apt-transport-https software-properties-common &&     curl -s "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb" > packages-microsoft-prod.deb &&     dpkg -i packages-microsoft-prod.deb &&     apt-get update &&     apt-get install -y powershell     && rm -rf /var/lib/apt/lists/*
Warning: : Empty continuation lines will become errors in a future release.
```

src/ci/docker/host-x86_64/x86_64-gnu-llvm-13/Dockerfile

@@ -25,7 +25,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   zlib1g-dev \
   xz-utils \
   nodejs \
-
+  \
 # Install powershell so we can test x.ps1 on Linux
     apt-transport-https software-properties-common && \
     curl -s "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb" > packages-microsoft-prod.deb && \

src/ci/docker/host-x86_64/x86_64-gnu-tools/Dockerfile

@@ -15,7 +15,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   xz-utils \
   tidy \
-
+  \
 # Install dependencies for chromium browser
   gconf-service \
   libasound2 \