Make "Some of the required fields are not found in the log" message softer

[rusefillc]

Current message is misleading because field is not really REQUIRED for upload to be successful.

In my opinion we should remove the message from the before-upload button in order to not scare users away like at https://rusefi.com/forum/viewtopic.php?p=41631#p41631

if we want to display any "for your information" we shall display it AFTER the log was uploaded

[rusefillc]

This is probably related to rusefi/rusefi#1627 @mck1117

Instead of engine_load we now have two separate

entry = fuelingLoad, @@GAUGE_NAME_FUEL_LOAD@@, float, "%.1f"
entry = ignitionLoad, @@GAUGE_NAME_IGNITION_LOAD@@, float, "%.1f"

open question which of these should be applied here

as a quick compatibility fix can we rename fuelingLoad into engine_load?