AK3: ensure no template files from beginner devs get to the ramdisk

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20220410
+# AK_BASE_VERSION=20220423

tools/ak3-core.sh

@@ -740,8 +740,12 @@ setup_ak() {
     ;;
   esac;
 
-  # automate simple multi-partition setup for boot_img_hdr_v3 + vendor_boot
+  # clean up any template placeholder files
   cd $home;
+  rm -f modules/system/lib/modules/placeholder patch/placeholder ramdisk/placeholder;
+  rmdir -p modules patch ramdisk;
+
+  # automate simple multi-partition setup for boot_img_hdr_v3 + vendor_boot
   if [ -e "/dev/block/bootdevice/by-name/vendor_boot$slot" -a ! -f vendor_setup ] && [ -f dtb -o -d vendor_ramdisk -o -d vendor_patch ]; then
     echo "Setting up for simple automatic vendor_boot flashing..." >&2;
     (mkdir boot-files;