fix(calc-questions): always calculate calculated answer if possible

We don't need to ensure that *every* dependency is non-hidden; indeed it
should be possible to evaluate an expression where parts of the dependencies
are not set. This is how the backend does it. Also, the `answer` transform
does have a default option, so we should easily be able to deal with this.

packages/form/addon/lib/field.js

@@ -274,10 +274,7 @@ export default class Field extends Base {
    */
   @cached
   get calculatedValue() {
-    if (
-      !this.question.isCalculated ||
-      !this.calculatedDependencies.every((field) => !field.hidden)
-    ) {
+    if (!this.question.isCalculated) {
       return null;
     }