[REG 14 -> 15] Excessive kit created by default.

1. Have MSVC 2019 and 2022 installed.
2. Have a valid qmake in PATH.
   I have Qt 6.7.2 from the official Online Installer.
3. Start Creator with parameter "-tcs".
4. Go to "Edit" -> "Preferences..." -> "Kits" -> Kits".
   Creator automatically creates one Python kit and two C++-based kits: "Desktop" and "x86-windows-msvc2019-pe-64bit (default)". They are both listed under "Manual". Both contain the same settings except that "Desktop" uses the compiler from MSVS 2022 whereas the other uses the compiler from MSVS 2019.

In the same situation, Creator 14 creates only one kit. That is using MSVS 2019 matching the Qt version in PATH.

Found by Squish test tst_default_settings.