Fix erroneous claim of board.I2C() by deinited display.

At the end of a session that called displayio.release_displays() (and did not initialize a new display), a board.I2C() bus that was previously used by a display would wrongly be considered still in use. While I can’t think of any unrecoverable problem this would cause in the next session, it violates the assumption that a soft reboot resets everything not needed by displays, potentially leading to confusion.

By itself, this change does not fix the problem yet - rather, it introduces the same issue as in #3581 for SPI. This needs to be solved in the same way for I2C and SPI.

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