[Property Wrappers] Use the outermost wrapper attribute type as the

contextual type for property wrapper initialization

lib/Sema/ConstraintSystem.cpp

@@ -4219,6 +4219,7 @@ void SolutionApplicationTarget::maybeApplyPropertyWrapper() {
   // the initializer type later.
   expression.wrappedVar = singleVar;
   expression.expression = backingInitializer;
+  expression.convertType = outermostWrapperAttr->getTypeLoc();
 }
 
 SolutionApplicationTarget SolutionApplicationTarget::forInitialization(