No need for line ending as the xml_text already contains it

[Timple]

I noticed the output xml always contained an extra (so two) line ending at the end of the file.

Since I have got a git-checker enabled for that, it anoyed me slightly. This fixes the double line-ending.

[Timple]

CI fails:

  Could not find a package configuration file provided by "Qt5" with any of
  the following names:
    Qt5Config.cmake
    qt5-config.cmake

I guess I didn't cause that.