Make "Start in Fullscreen" work with the DX9 plugin. Also a partial fix to the problem with Windows not saving the window size correctly when not rendering to main.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5352 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoDX9/Src/main.cpp

@@ -248,6 +248,9 @@ void Initialize(void *init)
 
 void Video_Prepare()
 {
+	// Tell the host the window is ready
+	g_VideoInitialize.pCoreMessage(WM_USER_CREATE);
+
 	// Better be safe...
 	s_efbAccessRequested = FALSE;
 	s_FifoShuttingDown = FALSE;