fuel_gauge: Remove keep alphabetized comment

The fuel gauge header asks to alphabetize the properties in order to keep
them organized and easy to read. However, this is difficult to enforce
without adding an adhoc script for just this header. In addition, there
aren't so many properties such that it's difficult to parse unsorted. Since
the alphabetization is already not followed and not likely to be easily
followed in the future, remove this ask from the header.

Remove "keep properties alphabetized" from the header.

Signed-off-by: Aaron Massey <aaronmassey@google.com>