Enable screenshot test.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4186 dfc29bdd-3216-0410-991c-e03cc46cb475

tests/main.cpp

@@ -102,7 +102,7 @@ int main(int argumentCount, char * arguments[])
 	TEST(ioScene);
 	// all driver checks
 	TEST(videoDriver);
-//	TEST(screenshot);
+	TEST(screenshot);
 	TEST(drawPixel);
 	TEST(drawRectOutline);
 	TEST(material);