[fixes #2327] mostly trivial: Added this. for field access and unified code gen of build() methods for @Builder.

test/transform/resource/after-delombok/BuilderInstanceMethod.java

@@ -38,7 +38,7 @@ class BuilderInstanceMethod<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public String build() {
-			return BuilderInstanceMethod.this.create(show, yes, also, $andMe);
+			return BuilderInstanceMethod.this.create(this.show, this.yes, this.also, this.$andMe);
 		}
 		@java.lang.Override
 		@java.lang.SuppressWarnings("all")