package/mender: fixing init script naming

Commit f88947c2fe2d (package/mender: adding systemv init file) added an init
script, but the installation logic referred to S04mender instead of S42mender.

Update the installation logic to match the file name.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
[Peter: expand commit message description]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mender/mender.mk

@@ -70,8 +70,8 @@ define MENDER_INSTALL_INIT_SYSTEMD
 endef
 
 define MENDER_INSTALL_INIT_SYSV
-	$(INSTALL) -D -m 755 package/mender/S04mender \
-		$(TARGET_DIR)/etc/init.d/S04mender
+	$(INSTALL) -D -m 755 package/mender/S42mender \
+		$(TARGET_DIR)/etc/init.d/S42mender
 endef
 
 $(eval $(golang-package))