fix(trashbin): action bar back button behaviour

Signed-off-by: alperozturk96 <alper_ozturk@proton.me>

Author: alperozturk96

app/src/main/java/com/owncloud/android/ui/navigation/NavigatorActivity.kt

@@ -143,8 +143,13 @@ class NavigatorActivity : DrawerActivity() {
             this,
             object : OnBackPressedCallback(true) {
                 override fun handleOnBackPressed() {
+                    val onBackPressListener = supportFragmentManager.fragments
+                        .filterIsInstance<NavigatorOnBackPressListener>()
+                        .firstOrNull()
+
                     when {
                         isDrawerOpen -> closeDrawer()
+                        onBackPressListener?.canInterceptBackPress() == true -> onBackPressListener.interceptBackPress()
                         supportFragmentManager.backStackEntryCount == 1 -> finish()
                         else -> pop()
                     }