Fix outputting of malformed XML in track file

[GideonBear]

Closes #683
I was not able to test it on the Android Studio emulator due to a lack of RAM, so if you want to test that it actually solves it please do. I'm assuming it does though.

[mnalis]

I've also not tested it, but it seems simple enough (famous last words 😃)

FYI @GideonBear, if you do want to test it, no need for installing complex developer environment, having enough resources on machine etc. -- you can instead make GitHub create ready-made .apk with just a few clicks in Actions tab of your fork; see instructions in https://github.com/Helium314/SCEE/blob/modified/CONTRIBUTING_A_NEW_QUEST.md#alternative-to-android-studio

[GideonBear]

I've also not tested it, but it seems simple enough (famous last words 😃)

FYI @GideonBear, if you do want to test it, no need for installing complex developer environment, having enough resources on machine etc. -- you can instead make GitHub create ready-made .apk with just a few clicks in Actions tab of your fork; see instructions in https://github.com/Helium314/SCEE/blob/modified/CONTRIBUTING_A_NEW_QUEST.md#alternative-to-android-studio

Oh, cool, that's good to know! I had Android Studio already installed and ran the emulator for my own app before, so I was expecting it to work, but that was a considerably less heavy app...