fix: clear timeout on start

[THOUSAND-SKY]

Prevents multiple consecutive starts from overwriting the timeout and leaving unwanted running timeouts in the background.

Navigating through router.push multiple times in a row makes multiple start events before a complete event, so timeouts were being left uncleared, which then left the progress bar going. It would be good to clear the timeout before starting another one, so I did that here.

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Name	Status	Preview	Comments	Updated (UTC)
next-progress	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 11:24am

[beeinger]

I'll try to have a look soon and release a new version with this included.

[beeinger]

I merged your PR to the fix/timeouts branch, will adjust it there and push to master and npm in a sec.