fixed toBuilder on Singular fields with wildcards (javac)

test/transform/resource/before/BuilderSingularWildcardListsWithToBuilder.java

@@ -0,0 +1,10 @@
+import java.util.List;
+import java.util.Collection;
+
+import lombok.Singular;
+
+@lombok.Builder(toBuilder = true)
+class BuilderSingularWildcardListsWithToBuilder {
+	@Singular private List<?> objects;
+	@Singular private Collection<? extends Number> numbers;
+}