Fixed deleting of CObjectManager

* fix in CApplication destructor
 * re-enabled unit tests

src/app/app.cpp

@@ -170,6 +170,9 @@ CApplication::~CApplication()
     delete m_private;
     m_private = nullptr;
 
+    delete m_objMan;
+    m_objMan = nullptr;
+
     delete m_eventQueue;
     m_eventQueue = nullptr;
 

test/unit/CMakeLists.txt

@@ -228,7 +228,7 @@ ${LIBSNDFILE_LIBRARY}
 add_executable(colobot_ut ${COLOBOT_SOURCES} ${UT_SOURCES} ${OPENAL_SOURCES})
 target_link_libraries(colobot_ut ${LIBS})
 
-#add_test(colobot_ut ./colobot_ut)
+add_test(colobot_ut ./colobot_ut)
 
 # TODO: change the unit cases to independent automated tests to be included in colobot_ut
 add_subdirectory(common)