Fix issue with key importation

vector/src/main/java/im/vector/riotredesign/features/crypto/keys/KeysImporter.kt

@@ -33,7 +33,7 @@ import timber.log.Timber
 class KeysImporter(private val session: Session) {
 
     /**
-     * Export keys and return the file path with the callback
+     * Import keys from provided Uri
      */
     fun import(context: Context,
                uri: Uri,

vector/src/main/java/im/vector/riotredesign/features/settings/VectorSettingsPreferencesFragment.kt

@@ -2702,6 +2702,8 @@ class VectorSettingsPreferencesFragment : VectorPreferenceFragment(), SharedPref
             importButton.setOnClickListener(View.OnClickListener {
                 val password = passPhraseEditText.text.toString()
 
+                displayLoadingView()
+
                 KeysImporter(mSession)
                         .import(requireContext(),
                                 uri,