[MM-44339] Remove unnecessary calls to show the main window (#2134)

src/main/windows/mainWindow.ts

@@ -124,10 +124,6 @@ function createMainWindow(options: {linuxAppIcon: string; fullscreen?: boolean})
         }
     });
 
-    mainWindow.once('show', () => {
-        mainWindow.show();
-    });
-
     mainWindow.once('restore', () => {
         mainWindow.restore();
     });

src/main/windows/windowManager.ts

@@ -213,7 +213,6 @@ export class WindowManager {
     // max retries allows the message to get to the renderer even if it is sent while the app is starting up.
     sendToRendererWithRetry = (maxRetries: number, channel: string, ...args: any[]) => {
         if (!this.mainWindow || !this.mainWindowReady) {
-            this.showMainWindow();
             if (maxRetries > 0) {
                 log.info(`Can't send ${channel}, will retry`);
                 setTimeout(() => {