Allow Decal Emission Energy values above 128 in the inspector

This also sets the maximum value for the slider to 16 to match
BaseMaterial3D (higher values can be entered or dragged manually).

(cherry picked from commit ae12244e1377c60d3dc3df22ba5a3c3fedbdfb47)

scene/3d/decal.cpp

@@ -231,7 +231,7 @@ void Decal::_bind_methods() {
 	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "texture_emission", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"), "set_texture", "get_texture", TEXTURE_EMISSION);
 
 	ADD_GROUP("Parameters", "");
-	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "emission_energy", PROPERTY_HINT_RANGE, "0,128,0.01"), "set_emission_energy", "get_emission_energy");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "emission_energy", PROPERTY_HINT_RANGE, "0,16,0.01,or_greater"), "set_emission_energy", "get_emission_energy");
 	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "modulate"), "set_modulate", "get_modulate");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "albedo_mix", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_albedo_mix", "get_albedo_mix");
 	// A Normal Fade of 1.0 causes the decal to be invisible even if fully perpendicular to a surface.