retropie pico-8 on 1:1 lenovo monitor take 2

 Setting up retropie for my square monitor.

Problems:

- flashing screen on both batocera and rteropie images. solved by editing `/boot/config.txt` to include `hdmi_group=2 hdmi_mode=9` 

- add pico-8. needed to add the rpi version of the softwaree then update `/etc/emulationstation/es_systems.txt` with the following:

 <system>
    <name>pico8</name>
    <fullname>PICO-8</fullname>
    <path>/home/pi/pico-8</path>
    <extension>.sh .SH</extension>
    <command>/opt/retropie/supplementary/runcommand/runcommand.sh 0 "/home/pi/pico-8/pico8 -draw_rect 0,0,800,600 -splore "</command>
    <platform>pico8</platform>
    <theme>pico8</theme>
  </system>

getting to `-draw_rect 0,0,800,600` took a bit of trial and error and I'm still not sure it's right because the monitor is 1:1 so why would it be that? but looks fullscreen now at least.

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