QmlDesigner: Let ~LibraryInitializer() throw exception

Because LibraryInitializer has no state it should be fine if it is used
like intended. The exception is anyway fatal.

Change-Id: I397e5b03e63d69f1468b46a8f333522629f1d882
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitelibraryinitializer.cpp

@@ -17,7 +17,7 @@ LibraryInitializer::LibraryInitializer()
     DatabaseBackend::initializeSqliteLibrary();
 }
 
-LibraryInitializer::~LibraryInitializer()
+LibraryInitializer::~LibraryInitializer() noexcept(false)
 {
     DatabaseBackend::shutdownSqliteLibrary();
 }