Fix paste speed clip broken on comma locale

CCBUG: 418121

src/timeline2/model/clipmodel.cpp

@@ -705,6 +705,7 @@ void ClipModel::setFakePosition(int fid)
 
 QDomElement ClipModel::toXml(QDomDocument &document)
 {
+    QLocale locale;
     QDomElement container = document.createElement(QStringLiteral("clip"));
     container.setAttribute(QStringLiteral("binid"), m_binClipId);
     container.setAttribute(QStringLiteral("id"), m_id);
@@ -729,7 +730,7 @@ QDomElement ClipModel::toXml(QDomDocument &document)
             }
         }
     }
-    container.setAttribute(QStringLiteral("speed"), m_speed);
+    container.setAttribute(QStringLiteral("speed"), locale.toString(m_speed));
     if (!qFuzzyCompare(m_speed, 1.)) {
         container.setAttribute(QStringLiteral("warp_pitch"), getIntProperty(QStringLiteral("warp_pitch")));
     }