Clifford Roche ce27d35924 palette2: Fix UART encoding
Raised from issue #5645, UTF-8 encoded symbols or other unexpected symbols on the UART raise an exception which causes klipper to stop. This change support UTF-8 encoded characters (from file names) as well as ignoring unexpected bytes.

Signed-off-by: Clifford Roche <clifford.roche@gmail.com>
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