Merge #12092: [qt] Replaces numbered place marker %2 with %1.

Merge #12092: [qt] Replaces numbered place marker %2 with %1.

8a93543419 Replaces numbered place marker %2 with %1. (251)

Pull request description:

  This PR closes #12015 in which @chen610620 suggests to replace numbered place marker `%2` with `%1`.

  Calling member function`QString::arg()` on a `QString` object with one arbitrary numbered place marker within the range [1,99] works, because `QString::arg()` replaces the _lowest_ numbered place marker in the `QString` object it is called on.

  [QString::arg documentation:](http://doc.qt.io/qt-5/qstring.html#arg)
  > Returns a copy of this string with the lowest numbered place marker replaced by string a, i.e., %1, %2, ..., %99.

  I suspect that the `%2` marker is just an unfortunate typo or the remainder of a string that used to have multiple numbered place markers.

  This PR replaces the numbered place marker `%2` with `%1` to avoid any confusion in the future.

Tree-SHA512: 0bb40cf3b9824e1eeba0a184e72358b30d20e8261e12deb287155b7cc8317ad0b0787ef1d0671325eb8bccc9e51b3037d737015749338c31cf400930840e56b6