Tests: Precheck buildfix

Some of Precheck jobs use Xcode 15, which lacks support for the
parenthesized initialization of aggregates.

Amends: 5a2261d0bd

Change-Id: Ib54f9b86e118f179eb9ec870b49581f948b4aec0
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

tests/unit/tests/unittests/qmldesignerutils/stringutils-test.cpp

@@ -86,6 +86,13 @@ using ConvertFunction = QString (*)(QStringView);
 
 struct EscapeParameters
 {
+    EscapeParameters(QString input, QString output, std::string name, ConvertFunction convert)
+        : input{std::move(input)}
+        , output{std::move(output)}
+        , name{std::move(name)}
+        , convert{convert}
+    {}
+
     QString input;
     QString output;
     std::string name;