setfill calls have no effect

[rconde01]

gnsstk/core/lib/FileHandling/RINEX3/Rinex3ObsHeader.cpp

Line 887 in c4b1b21

setfill('0');

Visual Studio warns that setfill is nodiscard and the result is not being used here.

According to https://en.cppreference.com/w/cpp/io/manip/setfill, the result must be "streamed" into a stream to have an effect.