Enable the unicorn/no-array-push-push ESLint plugin rule

There's generally speaking no need to use multiple consecutive `Array.prototype.push()` calls, since that method accepts multiple arguments, and this ESLint rule helps enforce that pattern.

Please see https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/no-array-push-push.md for additional information.

src/display/canvas.js

@@ -366,8 +366,7 @@ function compileType3Glyph(imgData) {
         points[p] &= (type >> 2) | (type << 2);
       }
 
-      coords.push(p % width1);
-      coords.push((p / width1) | 0);
+      coords.push(p % width1, (p / width1) | 0);
 
       if (!points[p]) {
         --count;