Remove or replace unnecessary BackHandler calls (#4148)

* Remove/replace `BackHandler` calls:

- For `UserProfileView`, remove the redundant `BackHandler` -> `navigateUp()` call.
- For `SetupBiometricView`, remove the `enabled = true` parameter, as this is the default value.

features/userprofile/shared/src/main/kotlin/io/element/android/features/userprofile/shared/UserProfileView.kt

@@ -7,7 +7,6 @@
 
 package io.element.android.features.userprofile.shared
 
-import androidx.activity.compose.BackHandler
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.consumeWindowInsets
@@ -51,7 +50,6 @@ fun UserProfileView(
     openAvatarPreview: (username: String, url: String) -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    BackHandler { goBack() }
     Scaffold(
         modifier = modifier,
         topBar = {

features/userprofile/shared/src/test/kotlin/io/element/android/features/userprofile/UserProfileViewTest.kt

@@ -34,7 +34,6 @@ import io.element.android.tests.testutils.ensureCalledOnce
 import io.element.android.tests.testutils.ensureCalledOnceWithParam
 import io.element.android.tests.testutils.ensureCalledOnceWithTwoParams
 import io.element.android.tests.testutils.pressBack
-import io.element.android.tests.testutils.pressBackKey
 import kotlinx.coroutines.test.runTest
 import org.junit.Rule
 import org.junit.Test
@@ -46,16 +45,6 @@ import org.robolectric.annotation.Config
 class UserProfileViewTest {
     @get:Rule val rule = createAndroidComposeRule<ComponentActivity>()
 
-    @Test
-    fun `on back key press - the expected callback is called`() = runTest {
-        ensureCalledOnce { callback ->
-            rule.setUserProfileView(
-                goBack = callback,
-            )
-            rule.pressBackKey()
-        }
-    }
-
     @Test
     fun `on back button click - the expected callback is called`() = runTest {
         ensureCalledOnce { callback ->