Unnecessary noise when saving presets

[ustk]

@Christoph-Hart I thought this has been dealt with a while ago?

[Christoph Hart]

Have you switched this somehow?

DOUBLE_TO_STRING_DIGITS

should default to 8.

looks like it's trying to use the full double precision logic when converting single float numbers to a string.

[ustk]

@Christoph-Hart not that I'm aware of, I didn't even know this macro
I checked and it's 8 as it should...