Run apt-get with '-y' flag when in nonint mode

Fixes #177

debian/changelog

@@ -1,3 +1,10 @@
+raspi-config (20220112) bullseye; urgency=medium
+
+  * Run apt-get with '-y' flag when in nonint mode
+    - https://github.com/RPi-Distro/raspi-config/issues/177
+
+ -- Serge Schneider <serge@raspberrypi.com>  Wed, 12 Jan 2022 09:04:54 +0000
+
 raspi-config (20220110) bullseye; urgency=medium
 
   * Add -q flag to wait.conf

raspi-config

@@ -826,14 +826,16 @@ do_vnc() {
   if [ $(get_vnc) -eq 0 ]; then
     DEFAULT=
   fi
+  APT_GET_FLAGS=""
   if [ "$INTERACTIVE" = True ]; then
     whiptail --yesno "Would you like the VNC Server to be enabled?" $DEFAULT 20 60 2
     RET=$?
   else
     RET=$1
+    APT_GET_FLAGS="-y"
   fi
   if [ $RET -eq 0 ]; then
-    if is_installed realvnc-vnc-server || apt-get install realvnc-vnc-server; then
+    if is_installed realvnc-vnc-server || apt-get install "$APT_GET_FLAGS" realvnc-vnc-server; then
       systemctl enable vncserver-x11-serviced.service &&
       systemctl start vncserver-x11-serviced.service &&
       STATUS=enabled