gui: Modal tweaks

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3292
LGTM: AudriusButkevicius, calmh

gui/default/syncthing/core/upgradingDialogView.html

@@ -1,3 +1,8 @@
-<modal id="upgrading" status="info" icon="arrow-circle-up" heading="{{'Upgrading' | translate}}">
-	<p><span translate>Syncthing is upgrading.</span> <span translate>Please wait</span>...</p>
+<modal id="upgrading" status="info" icon="arrow-circle-up" heading="{{'Upgrading' | translate}}" large="no" closeable="no">
+  <div class="modal-body">
+    <p>
+      <span translate>Syncthing is upgrading.</span>
+      <span translate>Please wait</span>...
+    </p>
+  </div>
 </modal>