Add a missing closing quote in INSTALLED_RECOVERY_BUILD_PROP_TARGET.

Missing that doesn't seem to affect correctness, but it upsets the
syntax parsing in my editor.

Test: `m -j out/target/product/marlin/recovery/root/prop.default` with
      aosp_marlin-userdebug.
Change-Id: I272f6a6e4fe67b3ef316aa38896a0df0b42228d0
diff --git a/core/Makefile b/core/Makefile
index da961f2..79934aa 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1606,7 +1606,7 @@
 		$(INSTALLED_ODM_BUILD_PROP_TARGET) \
 		$(INSTALLED_PRODUCT_BUILD_PROP_TARGET) \
 		$(INSTALLED_PRODUCT_SERVICES_BUILD_PROP_TARGET)
-	@echo "Target recovery buildinfo: $@
+	@echo "Target recovery buildinfo: $@"
 	$(hide) mkdir -p $(dir $@)
 	$(hide) rm -f $@
 	$(hide) cat $(INSTALLED_DEFAULT_PROP_TARGET) > $@