webui-desktop: do not kill cockpit-ws if BROWSER dies

In recent boot.iso we noticed firefox crashing under wayland.
This would kill also cockpit-ws, to which tests would be connecting
remotely, therefore destroying the whole test run.

Although firefox crashing is serious and will be reported, we don't have
to block the while test suite run on that, since we run tests remotely.

webui-desktop

@@ -104,6 +104,12 @@ exec > >(systemd-cat -t anaconda) 2>&1
 # Cleanup function
 cleanup() {
     set +e
+    if [[ "$WEBUI_REMOTE" == "1" ]]
+    then
+        echo "Warning: BROWSER died unexpectedly. Not doing further cleanup as we might be connecting remotely."
+        wait $WS_PID
+    fi
+
     kill $WS_PID
     wait $WS_PID
     kill $B_PID