[FEATURE REQUEST] allow side lights to be set for infinite duration

[mogorman]

Printer model

XL

Describe the feature

I take timelapses as I print. the problem I am having is the light strips dim during the printing I would like to use the M151 command to set the led to bright white. the problem is i can only set it for X ms. Setting it to 0 only works with AFS

Expected functionality

Being able to pass D0 to the M151 command