Remove workaround for unloading of project parent

Fields are no longer unloaded when a transaction commits (`DataNucleus.RetainValues` is enabled globally), as of stevespringett/Alpine#552.

Signed-off-by: nscuro <[email protected]>

src/main/java/org/dependencytrack/persistence/ProjectQueryManager.java

@@ -596,11 +596,6 @@ public Project updateProject(Project transientProject, boolean commitIndex) {
             } else {
                 project.setCollectionTag(null);
             }
-            // Force loading parent. This seems useless but somehow the code block above magically unloads the parent,
-            // making it missing in the API response. Following line enforces it to be available again.
-            // For reference see following Unit Test which would fail without this:
-            // org.dependencytrack.resources.v1.ProjectResourceTest.patchProjectParentTest
-            project.getParent();
 
             return persist(project);
         });