修复静音没有声音bug

(cherry picked from commit c6f05b73a1805f1566ca99f1e70b6fb873655f98)

MoviaBox/Libs/Player/SPPlayer.swift

@@ -257,6 +257,16 @@ extension SPPlayer {
                 self.delegate?.sp_playCompletion?(self)
             }
         }
+        
+        player.playerReadyToPlay = { (asset, assetURL) in
+            do {
+                try AVAudioSession.sharedInstance().setCategory(.playback)
+                try AVAudioSession.sharedInstance().setActive(true)
+            } catch {
+                
+            }
+
+        }
     }
     
 }