fix resetting url when different option selected

We don't want to overwrite the text a user has entered when switching options, but we need to set it once at least.

app/src/main/java/com/duckduckgo/app/generalsettings/showonapplaunch/ShowOnAppLaunchActivity.kt

@@ -115,7 +115,7 @@ class ShowOnAppLaunchActivity : DuckDuckGoActivity() {
                     }
                 }
 
-                if (binding.specificPageUrlInput.text != viewState.specificPageUrl) {
+                if (binding.specificPageUrlInput.text.isBlank()) {
                     binding.specificPageUrlInput.text = viewState.specificPageUrl
                 }
             }