Using trayTemplate icon

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/main/tray.ts

@@ -16,14 +16,11 @@ import { exitApp } from "./exit-app";
 // note: instance of Tray should be saved somewhere, otherwise it disappears
 export let tray: Tray;
 
-// refresh icon when MacOS dark/light theme has changed
-nativeTheme?.on("updated", () => tray?.setImage(getTrayIcon()));
-
-export function getTrayIcon(isDark = nativeTheme.shouldUseDarkColors): string {
+export function getTrayIcon(): string {
   return path.resolve(
     __static,
     isDevelopment ? "../build/tray" : "icons", // copied within electron-builder extras
-    `tray_icon${isDark ? "_dark" : ""}.png`
+    "trayTemplate.png"
   );
 }