Use actual openURL method in demo

[ASalavei]

Fixes the following error on iOS 18:

The caller of UIApplication.openURL(_:) needs to migrate to the non-deprecated UIApplication.open(_:options:completionHandler:). Force returning false (NO).

Related bug: https://youtrack.jetbrains.com/issue/CMP-6699

[elijah-semyonov]

It's a demo bug

[elijah-semyonov]

The actual reported one is here:
https://github.com/JetBrains/skiko/blob/1ca83c19144127faedbff1c65967d8381c252114/skiko/src/uikitMain/kotlin/org/jetbrains/skiko/Actuals.uikit.kt#L6

I guess we just need to move it out of Skiko?

[ASalavei]

The actual reported one is here: https://github.com/JetBrains/skiko/blob/1ca83c19144127faedbff1c65967d8381c252114/skiko/src/uikitMain/kotlin/org/jetbrains/skiko/Actuals.uikit.kt#L6

I guess we just need to move it out of Skiko?

@elijah-semyonov , this MR - just a related fix.
And you're right, the bug came from skiko, the fix will be there soon.

[ASalavei]

@elijah-semyonov , FYI: JetBrains/skiko#990