ATL-667: Show dirty indicator on unclosable widget

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

arduino-ide-extension/src/browser/style/index.css

@@ -5,6 +5,7 @@
 @import './arduino-select.css';
 @import './status-bar.css';
 @import './terminal.css';
+@import './editor.css';
 
 .theia-input.warning:focus {
     outline-width: 1px;