[GSoC'24] Refactor: use prefill value in integer dialog

[criticalAY]

Purpose / Description

This PR refactor IntegerDialog class to handle use case in

• [GSoC'24] Enhancement: add long press listener on cloze button #16735

We want to allow the current cloze number to be displayed in the dialog input box

How Has This Been Tested?

Locally

Checklist

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• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner