public boolean backward() {
			if (!canGoBack.get()) return false;
			int current = pages.indexOf(selectedPage.get());
			selectedPage.set(pages.get(current - 1));
			return true;
		}
Go back a page if allowed.

@return {@code true} when moved.
recaf-ui/src/main/java/software/coley/recaf/ui/wizard/Wizard.java