[LYN-4410] Back buttons should preserve selected gems (#1359)

Code/Tools/ProjectManager/Source/UpdateProjectCtrl.cpp

@@ -89,17 +89,18 @@ namespace O3DE::ProjectManager
         return ProjectManagerScreen::UpdateProject;
     }
 
+    // Called when pressing "Edit Project Settings..."
     void UpdateProjectCtrl::NotifyCurrentScreen()
     {
         m_stack->setCurrentIndex(ScreenOrder::Settings);
         Update();
+
+        // Gather the available gems that will be shown in the gem catalog.
+        m_gemCatalogScreen->ReinitForProject(m_projectInfo.m_path, /*isNewProject=*/false);
     }
 
     void UpdateProjectCtrl::HandleGemsButton()
     {
-        // The next page is the gem catalog. Gather the available gems that will be shown in the gem catalog.
-        m_gemCatalogScreen->ReinitForProject(m_projectInfo.m_path, /*isNewProject=*/false);
-
         m_stack->setCurrentWidget(m_gemCatalogScreen);
         Update();
     }