Window size for security and error dialogs is wrong

The FX deployment security and error dialogs are not the right size, making the contents unreadable in many cases. Because they are non-resizable windows, this is a serious issue for Applets and Web Start applications.

To reproduce the bug:

1. Uninstall any previous version of JavaFX 2.0

2. Build the latest graphics scrum as follows:

    A. Ensure that you have the following repos in your local forest (in addition to top-level): glass, runtime, deploy

    B. Run "ant sdk-no-docs deploy apps" from the top-level jfx dir:

3. Install JavaFX from: artifacts/public/sdk/javafx-2.0-beta-windows-i586.exe

4. Open the following in your browser: artifacts/deployed/DefaultSignedApp/SignedFish.html

You will see a security dialog but part of it will be cut off. Some other security and error dialogs are even worse.