wasm: fix error in 'cut' synthesized key

Pick-to: 6.5
Change-Id: Idca32c8cedb60563f8f1054d6634ab0411c07d9b
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>

src/plugins/platforms/wasm/qwasmclipboard.cpp

@@ -50,7 +50,7 @@ static void qClipboardCutTo(val event)
     if (!QWasmIntegration::get()->getWasmClipboard()->hasClipboardApi()) {
         // Send synthetic Ctrl+X to make the app cut data to Qt's clipboard
          QWindowSystemInterface::handleKeyEvent(
-                     0, QEvent::KeyPress, Qt::Key_C, Qt::ControlModifier, "X");
+                     0, QEvent::KeyPress, Qt::Key_X, Qt::ControlModifier, "X");
    }
 
     commonCopyEvent(event);