Timers: Be more lentient with intent phrasing

[tannisroot]

Sometimes Whisper does transcriptions that are slightly off, and despite me saying for example "Set a timer for 5 seconds" it transcribes it as "Set the timer for 5 seconds" which shouldn't be a big deal, but the intent does not work with "the": With "a" it works fine:

[synesthesiam]

Good catch. I can add this 👍

[synesthesiam]

This has been added.