"[p]seek 00:00" doesn't work

### What Red version are you using?

3.5.24

### Cog name

Audio

### Command name

seek

### What did you expect to happen?

Since the command help shows `00:00` and `00:00:00` as examples, and indeed I want to return to the start of the track, I expected that to work.

### What actually happened?

"Invalid input for the time to seek."

### How can we reproduce this error?

1. Install and boot up an instance of Red
3. Play any track with the Audio cog
4. Use `[p]seek 00:00`
### Anything else?

The current alternative is either `[p]seek 00:01` or `[p]seek -1000000000`

Relevant code is: https://github.com/Cog-Creators/Red-DiscordBot/blob/61484f28f7fcfff81309cb2b0b0d5287c921f1ad/redbot/cogs/audio/core/commands/controller.py#L354

Screenshot:

Start in redbot/cogs/audio/core/commands/controller.py around the referenced seek command and reproduce the failure with [p]seek 00:00 on a playing track. Trace how the time argument is parsed, then verify that both documented zero-time formats seek to the beginning without an invalid-input error.

Written by the indexing model from the issue text.