[Reader IA] Fix crash on Subfilter Sheet when rotating the device

[thomashorta]

Fixes #19991

Fixes the crash by using the same context as the bottom sheet (instead of trying to use an outdated scope that doesn't exist anymore) and making sure to remove the Dialog's onShowListener after executing the initialization code, to avoid it being called again (after rotation everything is recreated anyway so we shouldn't be calling the old bottom sheet).

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To Test:

• Tap on main dropdown menu and select Subscriptions
• Tap on “Tags” pill, let the app open the bottom menu (do not select a tag yet)
• Rotate the device
• Verify the app doesn't crash anymore

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Regression Notes

1. Potential unintended areas of impact

   • N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   • N/A

3. What automated tests I added (or what prevented me from doing so)

   • N/A

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PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

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[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20081-7284c6c
	Commit	7284c6c
	Direct Download	jetpack-prototype-build-pr20081-7284c6c.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20081-7284c6c
	Commit	7284c6c
	Direct Download	wordpress-prototype-build-pr20081-7284c6c.apk

Note: Google Login is not supported on these builds.

[daniloercoli]

LGTM!