rearrange state declarations for pages

totalPages shouldn't need to be in state, since this component won't be changing it.

renamed pageNumberInput to just pageInput.  Was just something that happened in the course of working on it.

currentPage doesn't need to have it's own state separate from pageInput, they should always be the same *value*.

client/homebrew/brewRenderer/toolBar/toolBar.jsx

@@ -7,13 +7,9 @@ const MAX_ZOOM = 300;
 const MIN_ZOOM = 10;
 
 const ToolBar = ({ onZoomChange, currentPage, onPageChange, totalPages })=>{
-	const [state, setState] = useState({
-		currentPage     : currentPage,
-		totalPages      : totalPages,
-		pageNumberInput : currentPage,
-	});
 
 	const [zoomLevel, setZoomLevel] = useState(100);
+	const [pageInput, setPageInput] = useState(currentPage);
 
 	useEffect(()=>{
 		onZoomChange(zoomLevel);