Don't consider included config options in conflict during SAVE_CONFIG when the have the same value as the one we are saving

[dberlin]

Right now, the include conflict detection of SAVE_CONFIG only checks whether we are trying to save an option that already exists in an included file.

In practice, these options are fine unless they actually conflict with the value we are trying to save.

An example is that i have the extruder heating config in an included file, and because you have to set a control mechanism, i set the control mechanism there (MPC in this case)

However, after calibration, it wants to also now wants to save the control type in the auto-save config.

Right now, SAVE_CONFIG considers this a conflict, even though it is saving the same value in both cases (mpc).

I will add a PR that makes SAVE_CONFIG only consider this a conflict if the two options actually differ. (it also updates the error message to print the conflicting values when they conflict)

[dberlin]

386 fixes this

[rogerlz]

thank you