MacOS: Closing with red button won't open window again through tray icon (#40)

* Fixed issue on MacOS where closing BW via the red button then reopening using tray icon wouldn't work

* Added MacOS only condition to the window recreation of the toggleWindow method. Made createWindow public in WindowMain.

src/electron/window.main.ts

@@ -81,7 +81,7 @@ export class WindowMain {
         });
     }
 
-    private async createWindow() {
+    async createWindow(): Promise<void> {
         this.windowStates[Keys.mainWindowSize] = await this.getWindowState(Keys.mainWindowSize, this.defaultWidth,
             this.defaultHeight);