Fix MongoDB install in Unifi script (#564)

Author: havardthom

install/unifi-install.sh

@@ -28,7 +28,7 @@ $STD apt-get update
 $STD apt-get install -y temurin-17-jre
 msg_ok "Installed Eclipse Temurin JRE"
 
-if grep -q 'avx' /proc/cpuinfo; then
+if ! grep -q -m1 'avx[^ ]*' /proc/cpuinfo; then
   msg_ok "No AVX Support Detected"
   msg_info "Installing MongoDB 4.2"
   if ! dpkg -l | grep -q "libssl1.1"; then