Fix code to also support external apps

[tiwiz]

No description provided.

[snippet-bot]

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• compose/snippets/src/main/java/com/example/compose/snippets/draganddrop/DragAndDropSnippets.kt:77, tag android_compose_drag_and_drop_7

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[JolandaVerhoef]

consider using LocalActivity.current?.let { activity -> so you have a non-null activity

[tiwiz]

Would it be clear, since it's outside the scope of the snippet?

[JolandaVerhoef]

I think it's okay. If people see you use activity they will know they need to get an activity from somewhere.