NFC: Remove an unnecessary use of NL_RemoveNonVisible

NL_QualifiedDefault already implies it.

Author: hamishknight

lib/Sema/CSDiagnostics.cpp

@@ -1626,8 +1626,7 @@ bool AssignmentFailure::diagnoseAsError() {
       if (auto typeContext = DC->getInnermostTypeContext()) {
         SmallVector<ValueDecl *, 2> results;
         DC->lookupQualified(typeContext->getSelfNominalTypeDecl(),
-                            VD->getFullName(),
-                            NL_QualifiedDefault | NL_RemoveNonVisible, results);
+                            VD->getFullName(), NL_QualifiedDefault, results);
 
         auto foundProperty = llvm::find_if(results, [&](ValueDecl *decl) {
           // We're looking for a settable property that is the same type as the