Fix icon issue for darwin.

v3/internal/templates/_common/Taskfile.tmpl.yml

@@ -354,7 +354,6 @@ tasks:
     generates:
       - "icons.icns"
       - "icons.ico"
-    method: timestamp
     cmds:
       # Generates both .ico and .icns files
       - wails3 generate icons -input appicon.png

v3/pkg/application/application.go

@@ -22,7 +22,6 @@ import (
 	"github.com/wailsapp/wails/v3/internal/assetserver/webview"
 	"github.com/wailsapp/wails/v3/internal/capabilities"
 	"github.com/wailsapp/wails/v3/pkg/events"
-	"github.com/wailsapp/wails/v3/pkg/icons"
 )
 
 //go:embed assets/*
@@ -162,9 +161,6 @@ func mergeApplicationDefaults(o *Options) {
 	if o.Description == "" {
 		o.Description = "An application written using Wails"
 	}
-	if o.Icon == nil {
-		o.Icon = icons.ApplicationLightMode256
-	}
 }
 
 type (
@@ -549,7 +545,9 @@ func (a *App) Run() error {
 	if runtime.GOOS == "darwin" {
 		a.impl.setApplicationMenu(a.ApplicationMenu)
 	}
-	a.impl.setIcon(a.options.Icon)
+	if a.options.Icon != nil {
+		a.impl.setIcon(a.options.Icon)
+	}
 
 	err = a.impl.run()
 	if err != nil {