Use correct icon for quicksettings tile

- It will be tinted by the system automatically

refs #31

app/src/main/AndroidManifest.xml

@@ -86,7 +86,7 @@
         <service
             android:name=".helpers.MyTileService"
             android:label="@string/app_launcher_name"
-            android:icon="@mipmap/ic_launcher"
+            android:icon="@drawable/img_widget_preview"
             android:permission="android.permission.BIND_QUICK_SETTINGS_TILE">
             <intent-filter>
                 <action android:name="android.service.quicksettings.action.QS_TILE" />

app/src/main/kotlin/com/simplemobiletools/flashlight/helpers/MyTileService.kt

@@ -1,6 +1,7 @@
 package com.simplemobiletools.flashlight.helpers
 
 import android.os.Build
+import android.service.quicksettings.Tile
 import android.service.quicksettings.TileService
 import android.support.annotation.RequiresApi
 
@@ -8,5 +9,8 @@ import android.support.annotation.RequiresApi
 class MyTileService : TileService() {
     override fun onClick() {
         MyCameraImpl.newInstance(this).toggleFlashlight()
+
+        qsTile.state = if (MyCameraImpl.isFlashlightOn) Tile.STATE_ACTIVE else Tile.STATE_INACTIVE
+        qsTile.updateTile()
     }
 }