Fixed wrong computation of relativistic clock correction.

...urements/modifiers/AbstractRelativisticClockModifier.java

...rs/RelativisticClockInterSatellitesPhaseModifierTest.java

...rs/RelativisticClockInterSatellitesRangeModifierTest.java

...difiers/RelativisticClockOneWayGNSSPhaseModifierTest.java

...difiers/RelativisticClockOneWayGNSSRangeModifierTest.java

...rements/modifiers/RelativisticClockPhaseModifierTest.java

...rements/modifiers/RelativisticClockRangeModifierTest.java