Keep certificate-directory problems on the station window and leave a hand-edit untouched until Save.

Co-authored-by: Cursor <cursoragent@cursor.com>

app.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"io"
 
-	wailsruntime "github.com/wailsapp/wails/v2/pkg/runtime"
+	"github.com/wailsapp/wails/v2/pkg/runtime"
 
 	"gitea.neitzel.de/konrad/funknetz/audio"
 	"gitea.neitzel.de/konrad/funknetz/station"
@@ -67,7 +67,7 @@ func (a *App) CancelConfig() {
 	}
 	quit := a.quit
 	if quit == nil {
-		quit = wailsruntime.Quit
+		quit = runtime.Quit
 	}
 	if a.ctx != nil {
 		quit(a.ctx)