revert change to generated swift code

Author: erik-krogh

swift/ql/lib/codeql/swift/generated/Element.qll

@@ -12,9 +12,9 @@ class ElementBase extends Synth::TElement {
   ElementBase getResolveStep() { none() } // overridden by subclasses
 
   final ElementBase resolve() {
-    not exists(this.getResolveStep()) and result = this
+    not exists(getResolveStep()) and result = this
     or
-    result = this.getResolveStep().resolve()
+    result = getResolveStep().resolve()
   }
 
   predicate isUnknown() { Synth::convertElementToRaw(this).isUnknown() }