Bug 220767 [Dialogs] PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL
3.3.x and 3.4 M5. The SWT.TOOL flag should be used to create hover style shells, hence the PopupDialog's HOVER_SHELLSTYLE should use SWT.TOOL.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
* flag is used as initial default and updated by the menu if it is shown.
	 */
	private boolean persistSize = false;
	/**
	 * Flag specifying whether the location of the popup should be persisted.
	 * This flag is used as initial default and updated by the menu if it is
	 * shown.
	 */
	private boolean persistLocation = false;
	/**
	 * Text to be shown in an optional title area (on top).
	 */
	private String titleText;
	/**
	 * Text to be shown in an optional info area (at the bottom).
	 */
	private String infoText;
	/**
	 * Constructs a new instance of <code>PopupDialog</code>.
	 * 
	 * @param parent
	 *            The parent shell.
	 * @param shellStyle
	 *            The shell style.
	 * @param takeFocusOnOpen
	 *            A boolean indicating whether focus should be taken by this
	 *            popup when it opens.
	 * @param persistSize
	 *            A boolean indicating whether the size should be persisted upon
	 *            close of the dialog. The size can only be persisted if the