tests: add test directories to core loader

Fixes all tests loading

test/CVcmiTestConfig.cpp

@@ -35,13 +35,13 @@ void CVcmiTestConfig::SetUp()
 	path+= "/" + TEST_DATA_DIR;
 	if(boost::filesystem::exists(path)){
 		auto loader = new CFilesystemLoader("test/", TEST_DATA_DIR);
-		dynamic_cast<CFilesystemList*>(CResourceHandler::get())->addLoader(loader, false);
+		dynamic_cast<CFilesystemList*>(CResourceHandler::get("core"))->addLoader(loader, false);
 
 		loader = new CFilesystemLoader("scripts/test/erm/", TEST_DATA_DIR+"erm/");
-		dynamic_cast<CFilesystemList*>(CResourceHandler::get())->addLoader(loader, false);
+		dynamic_cast<CFilesystemList*>(CResourceHandler::get("core"))->addLoader(loader, false);
 
 		loader = new CFilesystemLoader("scripts/test/lua/", TEST_DATA_DIR+"lua/");
-		dynamic_cast<CFilesystemList*>(CResourceHandler::get())->addLoader(loader, false);
+		dynamic_cast<CFilesystemList*>(CResourceHandler::get("core"))->addLoader(loader, false);
 
 	}
 }