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/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/qrcode/confirmation/QrCodeConfirmationView.kt

@@ -45,9 +45,8 @@ fun QrCodeConfirmationView(
     onCancel: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    BackHandler {
-        onCancel()
-    }
+    BackHandler(onBack = onCancel)
+
     val icon = when (step) {
         is QrCodeConfirmationStep.DisplayCheckCode -> CompoundIcons.Computer()
         is QrCodeConfirmationStep.DisplayVerificationCode -> CompoundIcons.LockSolid()

features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/qrcode/error/QrCodeErrorView.kt

@@ -45,16 +45,14 @@ fun QrCodeErrorView(
     onRetry: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    BackHandler {
-        onRetry()
-    }
+    BackHandler(onBack = onRetry)
     FlowStepPage(
         modifier = modifier,
         iconStyle = BigIcon.Style.AlertSolid,
         title = titleText(errorScreenType, appName),
         subTitle = subtitleText(errorScreenType, appName),
         content = { Content(errorScreenType) },
-        buttons = { Buttons(onRetry) }
+        buttons = { Buttons(onRetry) },
     )
 }