Fix another non integer argument to randomrange :^)

lib/captcha/generators/grid.js

@@ -41,7 +41,7 @@ module.exports = async () => {
 	for(let j = 0; j < size; j++) { //for each row
 
 		//x offset for whole row (not per character or it gets way too difficult to solve)
-		let cxOffset = await randomRange(0, spaceSize * 1.5);
+		let cxOffset = await randomRange(0, Math.floor(spaceSize * 1.5));
 
 		for(let i = 0; i < size; i++) { //for character in row
 			const index = (j*size)+i;