Correct issue with default.project.json files with no name being named default after change (#917)

Co-authored-by: Kenneth Loeffler <kenloef@gmail.com>

rojo-test/serve-tests/sync_rule_no_name_project/src/not_a_project.rojo

@@ -0,0 +1,8 @@
+{
+    "tree": {
+        "$className": "StringValue",
+        "$properties": {
+            "Value": "If this isn't named `not_a_project`, something has gone wrong!"
+        }
+    }
+}