Fix MainActivity.kt

不知道理解的对不对，第244行好像是打错了？

app/src/main/java/com/lizongying/mytv/MainActivity.kt

@@ -241,7 +241,7 @@ class MainActivity : FragmentActivity() {
 
     fun saveBootStartup(bootStartup: Boolean) {
         with(sharedPref.edit()) {
-            putBoolean(CHANNEL_NUM, channelNum)
+            putBoolean(BOOT_STARTUP, bootStartup)
             apply()
         }
         this.bootStartup = bootStartup
@@ -537,4 +537,4 @@ class MainActivity : FragmentActivity() {
         private const val CHANNEL_NUM = "channel_num"
         const val BOOT_STARTUP = "boot_startup"
     }
-}
+}