Do not prompt error onTetheringFailed

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetherManager.kt

@@ -94,7 +94,10 @@ sealed class TetherManager(protected val parent: TetheringFragment) : Manager(),
     protected abstract fun stop()
 
     override fun onTetheringStarted() = data.notifyChange()
-    override fun onTetheringFailed() = SmartSnackbar.make(R.string.tethering_manage_failed).show()
+    override fun onTetheringFailed() {
+        DebugHelper.log(javaClass.simpleName, "onTetheringFailed")
+        data.notifyChange()
+    }
 
     override fun bindTo(viewHolder: RecyclerView.ViewHolder) {
         (viewHolder as ViewHolder).manager = this

mobile/src/main/java/be/mygod/vpnhotspot/manage/TetheringTileService.kt

@@ -9,6 +9,7 @@ import android.service.quicksettings.Tile
 import android.widget.Toast
 import androidx.annotation.RequiresApi
 import androidx.core.content.ContextCompat
+import be.mygod.vpnhotspot.DebugHelper
 import be.mygod.vpnhotspot.R
 import be.mygod.vpnhotspot.TetheringService
 import be.mygod.vpnhotspot.net.TetherType
@@ -101,7 +102,10 @@ sealed class TetheringTileService : TetherListeningTileService(), TetheringManag
     }
 
     override fun onTetheringStarted() = updateTile()
-    override fun onTetheringFailed() = SmartSnackbar.make(R.string.tethering_manage_failed).show()
+    override fun onTetheringFailed() {
+        DebugHelper.log(javaClass.simpleName, "onTetheringFailed")
+        updateTile()
+    }
 
     class Wifi : TetheringTileService() {
         override val labelString get() = R.string.tethering_manage_wifi

mobile/src/main/res/values-zh-rCN/strings.xml

@@ -56,7 +56,6 @@
     <string name="tethering_manage_wifi">WLAN 热点</string>
     <string name="tethering_manage_wifi_legacy">WLAN 热点 (旧 API)</string>
     <string name="tethering_manage_bluetooth">蓝牙网络共享</string>
-    <string name="tethering_manage_failed">Android 系统无法打开网络共享。</string>
 
     <string name="connected_state_incomplete">（正在连接）</string>
     <string name="connected_state_valid">（已连接）</string>

mobile/src/main/res/values/strings.xml

@@ -59,7 +59,6 @@
     <string name="tethering_manage_wifi">Wi\u2011Fi hotspot</string>
     <string name="tethering_manage_wifi_legacy">Wi\u2011Fi hotspot (legacy)</string>
     <string name="tethering_manage_bluetooth">Bluetooth tethering</string>
-    <string name="tethering_manage_failed">Android system has failed to start tethering.</string>
 
     <string name="connected_state_incomplete">" (connecting)"</string>
     <string name="connected_state_valid">" (reachable)"</string>