added maximize button on resizable windows

src/platforms/rcore_desktop_win32.c

@@ -141,7 +141,7 @@ static PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB = NULL;
 #define STYLE_MASK_READONLY     (WS_MINIMIZE | WS_MAXIMIZE)
 #define STYLE_MASK_WRITABLE     (~STYLE_MASK_READONLY)
 
-#define STYLE_FLAGS_RESIZABLE   WS_THICKFRAME
+#define STYLE_FLAGS_RESIZABLE   (WS_THICKFRAME | WS_MAXIMIZEBOX)
 
 #define STYLE_FLAGS_UNDECORATED_OFF     (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
 #define STYLE_FLAGS_UNDECORATED_ON      WS_POPUP