try to ping the accessibility service multiple times when checking if it is crashed

[sds100]

Developer TODO (don't remove)

• create new branch. put issue number at start of name if not a very quick fix.
• write tests. put issue number in comment
• update documentation
• squash and merge
• delete branch

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Describe the bug
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To Reproduce
Steps to reproduce the behavior:

Upload a backup of your keymaps. (Follow the guide here.)[https://sds100.github.io/KeyMapper/user-guide/backup-restore]

Expected behavior
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Screenshots
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Smartphone (please complete the following information):

• Device: [e.g. OnePlus 6T]
• Android version: [e.g. Android 10]

Additional context
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[sds100]

implemented