Correct update channels.

src/main/index.ts

@@ -77,6 +77,9 @@ function createWindow(): void {
     y: number | undefined;
   };
 
+  const currentReleaseChannel: string =
+    (store.get("app.channel") as string) || autoUpdater.channel || "latest";
+
   // Validate window position is on screen
   const { validX, validY } = ensureWindowOnScreen(x, y, width, height);
 
@@ -236,21 +239,25 @@ function createWindow(): void {
               submenu: [
                 {
                   label: "Alpha",
-                  checked: autoUpdater.channel === "alpha",
+                  type: "radio",
+                  checked: currentReleaseChannel === "alpha",
                   click: (): void => {
                     checkForAppUpdates("alpha");
                   },
                 },
                 {
                   label: "Beta",
-                  checked: autoUpdater.channel === "beta",
+                  type: "radio",
+                  checked: currentReleaseChannel === "beta",
+
                   click: (): void => {
                     checkForAppUpdates("beta");
                   },
                 },
                 {
                   label: "Latest",
-                  checked: autoUpdater.channel === "latest",
+                  type: "radio",
+                  checked: currentReleaseChannel === "latest",
                   click: (): void => {
                     checkForAppUpdates("latest");
                   },