package/opkg-utils: actually install to target

Commit b9bf1c6535cb (package/opkg-utils: add opkg-utils as target pkg)
misspelled the macro to install to target, most probably as a bad
copy-paste from the host macro.

Fix that.

Reported-by: Michael Hacker <mh@superbox.one>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/opkg-utils/opkg-utils.mk

@@ -16,7 +16,7 @@ HOST_OPKG_UTILS_DEPENDENCIES = \
 	host-xz
 
 # Nothing to build; only scripts to install.
-define OPKG_UTILS_INSTALL_CMDS
+define OPKG_UTILS_INSTALL_TARGET_CMDS
 	$(MAKE) -C $(@D) PREFIX=$(TARGET_DIR) install-utils
 endef