srt: Weird double-up in pbkeylen enum

There's a duplicate 0 entry in the GstSRTKeyLength enum that seems unnecessary and is publically exposed in the pbkeylen property of the SRT elements:

/**
 * GstSRTKeyLengthBits:
 * @GST_SRT_KEY_LENGTH_NO_KEY: no encryption
 * @GST_SRT_KEY_LENGTH_0: no encryption
 * @GST_SRT_KEY_LENGTH_16: 16 bytes (128-bit) length
 * @GST_SRT_KEY_LENGTH_24: 24 bytes (192-bit) length
 * @GST_SRT_KEY_LENGTH_32: 32 bytes (256-bit) length
 *
 * Crypto key length in bits
 */
typedef enum
{
  GST_SRT_KEY_LENGTH_NO_KEY = 0,
  GST_SRT_KEY_LENGTH_0 = GST_SRT_KEY_LENGTH_NO_KEY,
  GST_SRT_KEY_LENGTH_16 = 16,
  GST_SRT_KEY_LENGTH_24 = 24,
  GST_SRT_KEY_LENGTH_32 = 32,
} GstSRTKeyLength;