Turn off electrical charge messages from Kerbalism by default

[Clayell]

The first thing that nearly every player does when starting a save is to turn off the low electrical charge notifications generated by Kerbalism, they simply aren't very useful for RO/RP-1. (relevant FAQ)

Relevant code in Kerbalism: (this is in GameParameters, so I wasn't sure how to write a MM patch for that)
https://github.com/Kerbalism/Kerbalism/blob/f5cd99c13274599f9f8964dc162cc887e4ac85ac/src/Kerbalism/System/Preferences.cs#L186-L187

Location within persistent.sfs:

GAME
{
	PARAMETERS
	{
		PreferencesMessages
		{
			ec = True
		}
	}
}