golang: Fix vars not passed when calling cache_cleanup

Fixes https://github.com/openwrt/packages/issues/13674.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/golang/golang-values.mk

@@ -249,6 +249,6 @@ GO_GENERAL_BUILD_CONFIG_VARS= \
 	GO_MOD_ARGS="$(GO_MOD_ARGS)"
 
 define Go/CacheCleanup
-	$(GENERAL_BUILD_CONFIG_VARS) \
+	$(GO_GENERAL_BUILD_CONFIG_VARS) \
 	$(SHELL) $(GO_INCLUDE_DIR)/golang-build.sh cache_cleanup
 endef