CI: switch KBL console into polling mode

In an attempt to debug/workaround occasional console freeze, switch it
to polling mode. If that helps, it will narrow down the search.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

automation/gitlab-ci/test.yaml

@@ -165,7 +165,7 @@
   variables:
     PCIDEV: "00:1f.6"
     PCIDEV_INTR: "MSI"
-    CONSOLE_OPTS: "console=com1 com1=115200,8n1,pci,msi"
+    CONSOLE_OPTS: "console=com1 com1=115200,8n1,pci,0"
     SUT_ADDR: test-3.testnet
   tags:
     - qubes-hw3