generic is the default kernel flavor in live-build on Ubuntu; remove hard-coded cargo-culting of this setting.

debian/changelog

@@ -13,6 +13,8 @@ livecd-rootfs (23.10.33) UNRELEASED; urgency=medium
   * Drop references to mythbuntu, obsolete after xenial.
   * Parameterize and consolidate live image definitions for flavors using
     a common pattern
+  * generic is the default kernel flavor in live-build on Ubuntu; remove
+    hard-coded cargo-culting of this setting.
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 06 Sep 2023 11:23:17 -0700
 

live-build/auto/config

@@ -802,7 +802,6 @@ case $PROJECT in
 	ubuntucinnamon)
 		add_task install minimal standard ubuntucinnamon-desktop
 		LIVE_TASK=ubuntucinnamon-live
-		KERNEL_FLAVOURS=generic
 		;;
 
 	xubuntu)
@@ -815,17 +814,11 @@ case $PROJECT in
 				;;
 		esac
 		LIVE_TASK='xubuntu-live'
-		case $ARCH in
-			amd64)	KERNEL_FLAVOURS=generic ;;
-		esac
 		;;
 
 	lubuntu)
 		add_task install minimal standard lubuntu-desktop
 		LIVE_TASK='lubuntu-live'
-		case $ARCH in
-			amd64)	KERNEL_FLAVOURS=generic ;;
-		esac
 		;;
 
 	ubuntu-gnome|ubuntu-unity)