Fix dependsOn Feature

[LorenzoAlu]

Hi :D

I found the bug in the code by comparing it with the native Laravel Nova code.
I improved the return on visibility and it seems to work correctly now ;)
Below is the native Nova code in dependFormField.js:

...

computed: {
    ...
    /**
     * Determine if the field is in visible mode
     */
    currentlyIsVisible() {
      return this.currentField.visible
    },
    ...
}
methods: {
    /**
     * Provide a function to fills FormData when field is visible.
     */
    fillIfVisible(formData, attribute, value) {
      if (this.currentlyIsVisible) {
        formData.append(attribute, value)
      }
    },
...

ps: Congratulations again on your great work ;)

[Tarpsvo]

Heya! Thanks for the PR. :) The fix is now live in version 4.4.2.