fixed 'hide dock on blur'

app/lib/window.ts

@@ -117,7 +117,7 @@ export class Window {
         })
 
         this.window.on('blur', () => {
-            if (this.configStore.appearance?.dock !== 'off' && this.configStore.appearance?.dockHideOnBlur) {
+            if ((this.configStore.appearance?.dock ?? 'off') !== 'off' && this.configStore.appearance?.dockHideOnBlur) {
                 this.hide()
             }
         })