Fix `is_unit_test` in module-info

`is_unit_test` is removed from module-info.json by mistake.

Bug: 309006256
Test: m out/target/product/vsoc_x86_64/module-info.json
Change-Id: I03ccc0efec83fbf5a0c6e548941bba6467ce8cd1
diff --git a/core/tasks/module-info.mk b/core/tasks/module-info.mk
index 8546828..aa695eb 100644
--- a/core/tasks/module-info.mk
+++ b/core/tasks/module-info.mk
@@ -39,7 +39,7 @@
 			$(call write-optional-json-list, "srcjars", $(sort $(ALL_MODULES.$(m).SRCJARS))) \
 			$(call write-optional-json-list, "classes_jar", $(sort $(ALL_MODULES.$(m).CLASSES_JAR))) \
 			$(call write-optional-json-list, "test_mainline_modules", $(sort $(ALL_MODULES.$(m).TEST_MAINLINE_MODULES))) \
-			$(call write-optional-json-bool, $(ALL_MODULES.$(m).IS_UNIT_TEST)) \
+			$(call write-optional-json-bool, "is_unit_test", $(ALL_MODULES.$(m).IS_UNIT_TEST)) \
 			$(call write-optional-json-list, "test_options_tags", $(sort $(ALL_MODULES.$(m).TEST_OPTIONS_TAGS))) \
 			$(call write-optional-json-list, "data", $(sort $(ALL_MODULES.$(m).TEST_DATA))) \
 			$(call write-optional-json-list, "runtime_dependencies", $(sort $(ALL_MODULES.$(m).LOCAL_RUNTIME_LIBRARIES))) \