Set program version depending on own version

src/Tools/tim_tool/ui/app-window.slint

@@ -57,10 +57,14 @@ export component MainWindow inherits Window {
         }
         Tab {
             title: "About";
-            AboutTab {}
+            about_tab := AboutTab {}
         }
     }
 
+    public function set_version(version: string) {
+        about_tab.version = version;
+    }
+
     public function change_to_load_file() {
         file_tab.state           = State.ConvertImage;
         tab_widget.current-index = 0;