Rover: remove redundant home-setting sanity checks

APMrover2/commands.cpp

@@ -19,14 +19,6 @@ bool Rover::set_home_to_current_location(bool lock)
 //  returns true if home location set successfully
 bool Rover::set_home(const Location& loc, bool lock)
 {
-    // check location is valid
-    if (loc.lat == 0 && loc.lng == 0 && loc.alt == 0) {
-        return false;
-    }
-    if (!check_latlng(loc)) {
-        return false;
-    }
-
     const bool home_was_set = ahrs.home_is_set();
 
     // set ahrs home