Fix blocked messages from groupchats

[joers2]

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What is it?

• [x] Bugfix
• [ ] Feature
• [ ] Codebase improvement

Description of the changes in your PR

Messages from groupchats weren't blocked when the recipient didn't have the senders number in their contactlist.

• Added a setting where users can now toggle on/off if they want to receive messages in groupchats if they haven't got their number in the contaclist.
• Added the logic for that in SmsReceiver.
• Made the function for that setting in settingsactivity

Please contact me if you need me to adjust something!

Fixes the following issue(s)

• Fixes #189

Acknowledgement

• [x] I read the contribution guidelines.

[Aga-C]

1. It's a bug fix, there shouldn't be an option whether someone wants to have proper or wrong behavior.
2. Have you tested if your bug fix works?

[fossifybot-legacy]

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