qmljs: correctly handle js string templates

In most cases we do want to visit the expressions in a function
template. Changing its accept0 would force those not wanting to visit
it to iterate on the templates (currently a linked list), so we add a
visit method explicitly visiting the expression in all the needed
places.

Fixes: QTCREATORBUG-21869
Change-Id: I47733544bfd32eec357810b97242608b8f7de572
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/libs/qmljs/qmljsscopeastpath.cpp

@@ -61,6 +61,12 @@ bool ScopeAstPath::preVisit(Node *node)
     return true;
 }
 
+bool ScopeAstPath::visit(AST::TemplateLiteral *node)
+{
+    Node::accept(node->expression, this);
+    return true;
+}
+
 bool ScopeAstPath::visit(UiPublicMember *node)
 {
     if (node && node->statement && node->statement->kind == node->Kind_Block