修改channel_name最大长度

Model/models.py

@@ -2398,7 +2398,7 @@ class UidChannelSetModel(models.Model):
     id = models.AutoField(primary_key=True, verbose_name='自增id')
     uid = models.ForeignKey(UidSetModel, to_field='id', on_delete=models.CASCADE)
     channel = models.IntegerField(default=1, verbose_name='通道号')
-    channel_name = models.CharField(blank=True, default='', max_length=20, verbose_name=u'通道名')
+    channel_name = models.CharField(blank=True, default='', max_length=32, verbose_name=u'通道名')
     pir_audio = models.SmallIntegerField(default=0, verbose_name='pir声音。0：关闭，1：开启')
     mic_audio = models.SmallIntegerField(default=0, verbose_name='mic声音。0：关闭，1：开启')
     battery_status = models.SmallIntegerField(default=0, verbose_name='低电量提醒状态。0：关闭，1：开启')