syslinux: update branding defaults

s/ALT Linux/ALT/g as per s/ALT Linux/BaseALT/g Ltd

features.in/syslinux/config.mk

@@ -3,7 +3,7 @@ use/syslinux: sub/stage1
 	@$(call add_feature)
 	@$(call add,STAGE1_PACKAGES,syslinux)
 	@$(call try,META_SYSTEM_ID,SYSLINUX)
-	@$(call set,RELNAME,ALT Linux ($(IMAGE_NAME)))
+	@$(call set,RELNAME,ALT ($(IMAGE_NAME)))
 
 # UI is overwritten
 use/syslinux/ui/%: use/syslinux

features.in/syslinux/generate.mk

@@ -71,7 +71,7 @@ distro: bootargs
 	@if [ -n "$(META_VOL_SET)" ]; then \
 		DISTRO="$(META_VOL_SET)"; \
 	else \
-		DISTRO="ALT Linux"; \
+		DISTRO="ALT"; \
 	fi; \
 	sed -i "s,@distro@,$$DISTRO," $(DSTDIR)/*.cfg