Tweak the volumetric fog temporal reprojection property hint

Values below 0.5 will cause constant flickering in most situations,
and values above 0.99 take a very long time to fully update
(10+ seconds at high framerates).

scene/resources/environment.cpp

@@ -1352,7 +1352,7 @@ void Environment::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_ambient_inject", PROPERTY_HINT_RANGE, "0.0,16,0.01,exp"), "set_volumetric_fog_ambient_inject", "get_volumetric_fog_ambient_inject");
 	ADD_SUBGROUP("Temporal Reprojection", "volumetric_fog_temporal_reprojection_");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "volumetric_fog_temporal_reprojection_enabled"), "set_volumetric_fog_temporal_reprojection_enabled", "is_volumetric_fog_temporal_reprojection_enabled");
-	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_temporal_reprojection_amount", PROPERTY_HINT_RANGE, "0.0,0.999,0.001"), "set_volumetric_fog_temporal_reprojection_amount", "get_volumetric_fog_temporal_reprojection_amount");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_temporal_reprojection_amount", PROPERTY_HINT_RANGE, "0.5,0.99,0.001"), "set_volumetric_fog_temporal_reprojection_amount", "get_volumetric_fog_temporal_reprojection_amount");
 
 	// Adjustment