live-preview: Fix MenuBar showing when "hide_ui" setting is set

Also remove extra button that was added by mistake under the view

Author: ogoffart

tools/lsp/ui/main.slint

@@ -44,7 +44,7 @@ export component PreviewUi inherits Window {
     icon: @image-url("assets/slint-logo-small-light.png");
     always-on-top <=> Api.always-on-top;
 
-    MenuBar {
+    if Api.show-preview-ui : MenuBar {
         Menu {
             title: @tr("File");
 
@@ -119,14 +119,6 @@ export component PreviewUi inherits Window {
         }
     }
 
-    Button {
-        icon: Icons.sync;
-        colorize-icon: true;
-        clicked => {
-            Api.reload-preview();
-        }
-    }
-
     init => {
         WindowGlobal.window-width = self.width;
         WindowGlobal.window-height = self.height;