Fixed a typo in the Add Tag Function

www/functions_SQLite.js

@@ -75,7 +75,7 @@ exports.addTag = function(req, res){
 
 	db.serialize(function(){
 		var query = "INSERT INTO tags (tagName, units) VALUES (?, ?)";
-		var preqQuery = db.prepare(query);
+		var prepQuery = db.prepare(query);
 		prepQuery.run(req.params.tagName, req.params.units, function(err){
 			prepQuery.finalize();
 			db.close();