Make hashCode consistent with equals in NameOccurrenceImpl

`image` was only used in `hashCode`.

Author: cirras

delphi-frontend/src/main/java/au/com/integradev/delphi/symbol/occurrence/NameOccurrenceImpl.java

@@ -115,6 +115,7 @@ public boolean equals(Object o) {
     return isExplicitInvocation == that.isExplicitInvocation
         && isGeneric == that.isGeneric
         && location.equals(that.location)
+        && Objects.equals(image, that.image)
         && Objects.equals(declaration, that.declaration)
         && typeParameters.equals(that.typeParameters);
   }