create handler function for controlled input

Moved onChange handler function to a component method and simplified it a smidge.

Must use parseInt now because the input type will change to 'text' rather than 'number'

client/homebrew/brewRenderer/brewRenderer.jsx

@@ -231,10 +231,6 @@ const BrewRenderer = (props)=>{
 		}));
 	};
 
-	// const handlePageChange = (pageNumber) => {
-    //     // Scroll to the desired page
-    //     scrollToPage(pageNumber);
-    // };
 
 	return (
 		<>