mixin.mk: set THE_IMAGEWRITER=imression for regular-gnome if not p10

conf.d/mixin.mk

@@ -94,7 +94,7 @@ ifneq (,$(filter-out e2k%,$(ARCH)))
 	@$(call add,THE_BRANDING,notes)
 endif
 	@$(call add,THE_PACKAGES,$$(THE_IMAGEWRITER))
-	@$(call set,THE_IMAGEWRITER,altmediawriter)
+	@$(call try,THE_IMAGEWRITER,altmediawriter)
 	@$(call add,THE_PACKAGES,upower udev-rules-rfkill-uaccess)
 	@$(call add,THE_PACKAGES,hunspell-ru-lebedev hunspell-en_US)
 	@$(call add,THE_PACKAGES,glmark2 glmark2-es2)
@@ -131,11 +131,12 @@ mixin/regular-gnome: use/x11/gnome use/fonts/ttf/redhat +nm-gtk4 \
 	@$(call add,THE_PACKAGES,power-profiles-daemon)
 	@$(call add,BASE_PACKAGES,gnome-software)
 	@$(call add,BASE_PACKAGES,gnome-tour)
-ifeq (,$(filter-out sisyphus p11,$(BRANCH)))
+ifneq (,$(filter-out p10,$(BRANCH)))
 	@$(call add,THE_PACKAGES,gnome-extension-manager)
 	@$(call add,PINNED_PACKAGES,gnome-console:Required)
 	@$(call add,THE_PACKAGES,gnome-console)
 	@$(call add,THE_PACKAGES,papers)
+	@$(call set,THE_IMAGEWRITER,impression)
 else
 	@$(call add,PINNED_PACKAGES,gnome-terminal:Required)
 	@$(call add,THE_PACKAGES,gnome-terminal)