Finish the sims page when airplane mode on

Bug: 335392575
Test: verify UI
Change-Id: I9d1e4c243e195abe8c917dc83ffed175f7ef74ec

src/com/android/settings/spa/network/SimOnboardingPageProvider.kt

@@ -83,7 +83,7 @@ object SimOnboardingPageProvider : SettingsPageProvider {
     ): String = "${name}/$subId"
 }
 
-private fun Context.getActivity(): Activity? = when (this) {
+fun Context.getActivity(): Activity? = when (this) {
     is Activity -> this
     is ContextWrapper -> baseContext.getActivity()
     else -> null