Fix Formatting loading.

Fix Formatting loading.

	* src/main/java/org/glom/web/shared/libglom/layout/LayoutItemField.java:
	getFormattingUsed(): Remove the duplicate Formatting member variable
	in favour of the one from the base class.
	* src/main/java/org/glom/web/shared/libglom/layout/LayoutItemWithFormatting.java:
	Initialize a new Formatting instead of using null by default, so we
	have some defaults, instead of having to initialize one later just to
	get the same defaults. This also makes loading of formatting from the
	document work, because that expected a non-null.