gnss_checks: always run strict checks on ground

With the goal to never take off if the GNSS solution is not fullfilling the configured requirements still not stopping to use it in case it degrades mid air.

src/modules/ekf2/EKF/aid_sources/gnss/gnss_checks.cpp

@@ -49,6 +49,11 @@ bool GnssChecks::run(const gnssSample &gnss, uint64_t time_us)
 
 	bool passed = false;
 
+	// Run strict checks while not flying yet
+	if (!_control_status.flags.in_air) {
+		_initial_checks_passed = false;
+	}
+
 	if (_initial_checks_passed) {
 		if (runSimplifiedChecks(gnss)) {
 			_time_last_pass_us = time_us;