EDS: Added FMT specifier in restarts so regtests can use lower precision

regtest/eds/rt-eds-adaptive/eds_restart.reference

regtest/eds/rt-eds-adaptive/plumed.dat

regtest/eds/rt-eds-append-restart/eds_restart

regtest/eds/rt-eds-append-restart/eds_restart.reference

regtest/eds/rt-eds-append-restart/plumed.dat

regtest/eds/rt-eds-covar/eds_restart.reference

regtest/eds/rt-eds-covar/plumed.dat

regtest/eds/rt-eds-dynamic-center/eds_restart.reference

regtest/eds/rt-eds-dynamic-center/plumed.dat

regtest/eds/rt-eds-ramp/eds_restart.reference

regtest/eds/rt-eds-ramp/plumed.dat

regtest/eds/rt-eds-read-restart/eds_restart.output.reference

regtest/eds/rt-eds-read-restart/plumed.dat

src/eds/EDS.cpp