fix: Auto color for alternative timestamp formats (IDFGH-14376)

[nebkat]

Description

Fixes auto coloring for different timestamp formats (including future formats as per https://github.com/espressif/esp-idf/blob/master/components/log/Kconfig.format).

Related

Introduced in d49533f

Testing

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[github-actions]

	Warnings
⚠️	The PR description looks very brief, please check if more details can be added.

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[peterdragun]

Hi @nebkat, thank you for spotting the issue and creating the fix for it, it is much appreciated!