Cache passphrase for edit

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EditKeyFragment.java

@@ -127,8 +127,6 @@ public class EditKeyFragment extends LoaderFragment implements
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
 
-        cachePassphraseForEdit();
-
         // Inflate a "Done"/"Cancel" custom action bar view
         ActionBarHelper.setTwoButtonView(((ActionBarActivity) getActivity()).getSupportActionBar(),
                 R.string.btn_save, R.drawable.ic_action_save,
@@ -177,6 +175,8 @@ public class EditKeyFragment extends LoaderFragment implements
             getActivity().finish();
         }
 
+        cachePassphraseForEdit();
+
         mChangePassphrase.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {