Inherited public fields cannot be accessed directly in HTL

Inherited public fields for a Java use-class cannot be accessed directly in HTL, due to how object properties resolution is implemented in https://github.com/apache/sling/blob/1aa2c8be782ecb858de9030501e67edc4aba1357/bundles/scripting/sightly/java-compiler/src/main/java/org/apache/sling/scripting/sightly/render/AbstractRuntimeObjectModel.java#L293.

When solving Fields the Field#getField method should be used instead.