Navigator: Show Projects after startup.

• Since migrating to Photon, the listeners of the IPersistencyService must be seemingly installed in the init phase. By that, the corresponding listeners are also aware of model loading.
• Also, remove an unneeded cast to avoid a warning.

Issue-Ref: 3540 Issue-Url: https://af3-developer.fortiss.org/issues/3540 Signed-off-by: Alexander Diewald diewald@fortiss.org

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/internal/.ratings

@@ -7,6 +7,6 @@ EditPartFactoryService.java e9180c0020f1769d9e24ef3c08f9ca5599dbc5c3 GREEN
 MarkerService.java b01b7706034691683df7bbc2e7828c42574b3147 GREEN
 ModelEditorBindingService.java 4c2b52008025db79b1ced4b695d60b561d17c51e GREEN
 ModelElementHandlerService.java 07a30545ad687ff0fe13bf7a9348c41fb03e0b2c GREEN
-NavigatorService.java 2b1361eac805996e22e5409dafff9707fbac3376 YELLOW
+NavigatorService.java 2b1361eac805996e22e5409dafff9707fbac3376 GREEN
 ToolingKernelUIInternal.java 38903445a9084b7908716a00f41621dfb3126fca GREEN
 TutorialUIService.java b1d632eca91b4feb583f3930cd6ee4722dd9bfed GREEN