Revert "Change local index initialization of uniqeph()."

This reverts commit 0531f6ad105b24bebfb91e5e9a8016818f424c30.
Change local index initialization of uniqeph().

"nav->eph[0].sat!=nav->eph[0].sat||nav->eph[0].iode!=nav->eph[0].iode"
is always false, therefore skippable.