Status msg, DWIN temp fixes

[classicrocker883]

Description

Fixes a couple small issues in the console/terminal.
It will say Printing... after heating - (in simulator) using these commands:

M104 S55
M140 S55
M109 S55

So the fix is to add a stop timer during first boot / initialization, however it doesnt fully go away after the initial start. it will keep saying this even though it isnt printing after a few more heating commands.

Fix AUTOTEMP_FACTOR resetting value. previously, the default value has no real effect. now it stays unless changed

• Only update factor if 'F' is strictly seen. If 'F' is NOT seen, we do nothing, preserving the previous or default value (0.1, 0, etc.)
• 'F0' still disables; 'F' by itself uses default. preserves original function: enabled using 'F' or 'F#'

Fix having no PREHEAT_LABEL for M303, Creality, ProUI, JyersUI LCD

Update PID_autotune logic. safeguard zero. dynamic time delay 5000UL for bed/chamber 3000UL for hotend - because hotends heat/cool at a faster rate.

Requirements

Benefits

Configurations

Related Issues

• Not sure to remove HAS_MULTI_HOTEND line in Temperature::set_heating_message - temperature.cpp
• Not sure if having POWER_LOSS_RECOVERY check is needed or not in MarlinUI::init - lcd/marlinui.cpp

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• AUTOTEMP_FACTOR seems to be useless. looks like M104 must use a value with F otherwise without F or a value for it it resets to 0.00
  fixed in this PR

[ellensp]

Th UI has always displayed E1, E2 etc while code says E0,E1 etc This is a deliberate design decision as UI users are not programmers (in general) and expect number to start at 1