Remove nonint whiptail msgbox in do_overlayfs

debian/changelog

@@ -1,3 +1,9 @@
+raspi-config (20220307) UNRELEASED; urgency=medium
+
+  * Remove nonint whiptail msgbox in do_overlayfs
+
+ -- Serge Schneider <serge@raspberrypi.com>  Mon, 07 Mar 2022 09:26:38 +0000
+
 raspi-config (20220303) bullseye; urgency=medium
 
   * Use wildcards for KMS test

raspi-config

@@ -2674,7 +2674,9 @@ do_overlayfs() {
     else
       BPRO="writable"
     fi
-    whiptail --msgbox "The boot partition is currently $BPRO. This cannot be changed while an overlay file system is enabled." 20 60 1
+    if [ "$INTERACTIVE" = True ]; then
+      whiptail --msgbox "The boot partition is currently $BPRO. This cannot be changed while an overlay file system is enabled." 20 60 1
+    fi
   else
     DEFAULT=--defaultno
     CURRENT=0