Windows: Don't use a dummy window (HDC) when finding a pixel format but use the actual window directly. This will avoid cases where the pixel format index for the dummy window's HDC wasn't valid for the actual window's HDC. It also avoid unnecessary complexity.

Fix FullScreenWindowedTest to use the Display's current BPP to avoid 24/16 bpp weirdness

src/java/org/lwjgl/test/opengl/FullScreenWindowedTest.java

@@ -80,7 +80,7 @@ public class FullScreenWindowedTest {
 	private void initialize() {
 		try {
 			//find displaymode
-			mode = findDisplayMode(800, 600, 16);
+			mode = findDisplayMode(800, 600, Display.getDisplayMode().getBitsPerPixel());
 			// start of in windowed mode
 			Display.create();
 			glInit();