declination test update values

- test values entered from https://www.ngdc.noaa.gov/geomag-web/

src/systemcmds/tests/test_autodeclination.cpp

@@ -24,7 +24,7 @@ private:
 
 bool AutoDeclinationTest::autodeclination_check()
 {
-	ut_assert("declination differs more than 0.1 degrees", get_mag_declination(47.0, 8.0) - 1.6f < 0.1f);
+	ut_assert("declination differs more than 0.1 degrees", get_mag_declination(47.0, 8.0) - 2.6f < 0.1f);
 	// Test world endpoints
 	ut_assert("declination differs more than 0.1 degrees", get_mag_declination(-90.0, 180.0) - 47.0f < 0.1f);
 	ut_assert("declination differs more than 0.1 degrees", get_mag_declination(-90.0, -180.0) - 47.0f < 0.1f);