Sqlite: Fix warnings

- use of uninitialized value
- unused local typedef

Change-Id: I60d6c3a9a04d9f603a102439582c9e55d85a191f
Reviewed-by: Marco Bubke <marco.bubke@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/sqlite/sqlitebasestatement.h

@@ -213,7 +213,7 @@ public:
     auto value(const QueryTypes &...queryValues)
     {
         Resetter resetter{this};
-        ResultType resultValue;
+        ResultType resultValue{};
 
         bindValues(queryValues...);