Merge pull request #627 from thomasgubler/beta_defaultwaittime

Set default autoland wait time to -1 (infinite wait)

src/modules/navigator/navigator_params.c

@@ -60,4 +60,4 @@ PARAM_DEFINE_INT32(NAV_ONB_MIS_EN, 0);
 PARAM_DEFINE_FLOAT(NAV_TAKEOFF_ALT, 10.0f);	// default TAKEOFF altitude
 PARAM_DEFINE_FLOAT(NAV_LAND_ALT, 5.0f);		// slow descend from this altitude when landing
 PARAM_DEFINE_FLOAT(NAV_RTL_ALT, 30.0f);		// min altitude for going home in RTL mode
-PARAM_DEFINE_FLOAT(NAV_RTL_LAND_T, 10.0f);	// delay after descend before landing
+PARAM_DEFINE_FLOAT(NAV_RTL_LAND_T, -1.0f);	// delay after descend before landing, if set to -1 the system will not land but loiter at NAV_LAND_ALT