SolarMutexGuard for ImplDbgTestSolarMutex assert in JunitTest_dbaccess_complex

Change-Id: Ic2109abdec0ad3305c2720ac9012585cd7ceb25b

sfx2/source/sidebar/SidebarController.cxx

@@ -193,6 +193,7 @@ void SidebarController::unregisterSidebarForFrame(SidebarController* pController
 
 void SidebarController::disposeDecks()
 {
+    SolarMutexGuard aSolarMutexGuard;
     mpCurrentDeck.clear();
     maFocusManager.Clear();
     mpResourceManager->disposeDecks();