Fix Malyan Extui (printer crash) #17855
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Requirements
Description
The Malyan M300 did not respond anymore from the lcd interface nor usb.
The bug was introduced in [d5b791a] where the parsing flag was reset before
being used. It implies all command were interpreted as gcode.
Moving the reset flag after the test fixed the issue.
[d5b791a] Fix Malyan ExtUI parse_lcd_byte
Benefits
The Malyan M300 does not crash anymore.
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