当清空网址跳转时，清空记录的地址

app/src/main/java/com/maxrocky/nativeview/fragment/StartFragment.kt

@@ -46,15 +46,22 @@ class StartFragment : Fragment() {
         }
 
         button.setOnClickListener {
+            val storageKey = stringPreferencesKey(STORAGE_URL)
             val url = urlEditText.text.trim().toString()
             if (url.isEmpty()) {
+                runBlocking {
+                    context?.dataStore?.edit {
+                        if (it.contains(storageKey)) {
+                            it.remove(storageKey)
+                        }
+                    }
+                }
                 findNavController().navigate(
                     R.id.action_startFragment_to_mainFragment,
                     MainFragment.createStartBundle()
                 )
                 return@setOnClickListener
             }
-            val storageKey = stringPreferencesKey(STORAGE_URL)
             runBlocking {
                 context?.dataStore?.edit { it[storageKey] = url }
             }