Reset WebDAV config state when the UI is left

app/src/main/java/com/stevesoltys/seedvault/plugins/webdav/WebDavHandler.kt

@@ -65,6 +65,10 @@ internal class WebDavHandler(
         }
     }
 
+    fun resetConfigState() {
+        _configState.value = WebDavConfigState.Empty
+    }
+
     /**
      * Searches if there's really an app backup available in the given storage location.
      * Returns true if at least one was found and false otherwise.

app/src/main/java/com/stevesoltys/seedvault/ui/storage/StorageViewModel.kt

@@ -99,6 +99,8 @@ internal abstract class StorageViewModel(
         }
     }
 
+    fun resetWebDavConfig() = webdavHandler.resetConfigState()
+
     @UiThread
     fun onWebDavConfigSuccess(properties: WebDavProperties, plugin: WebDavStoragePlugin) {
         mLocationSet.setEvent(true)

app/src/main/java/com/stevesoltys/seedvault/ui/storage/WebDavConfigFragment.kt

@@ -93,6 +93,11 @@ class WebDavConfigFragment : Fragment(), View.OnClickListener {
         }
     }
 
+    override fun onDestroy() {
+        viewModel.resetWebDavConfig()
+        super.onDestroy()
+    }
+
     private fun onConfigStateChanged(state: WebDavConfigState) {
         when (state) {
             WebDavConfigState.Empty -> {