Fix build for KF < 5.64
The last commit introduced a method which require at least KF 5.64, making Krusader unable to compile with older releases.
Compiled on:
- Fedora 32 (Clang10.0.1 / Gcc10.2.1 - Qt5.13.2 - Kf5.75.0)
- Fedora 33 (Clang11.0.0 / Gcc10.3.1 - Qt5.15.2 - Kf5.79.0)
- Fedora 34 (Clang12.0.1 / Gcc11.2.1 - Qt5.15.2 - Kf5.83.0)
- Ubuntu 18.04 (Clang6.0.0 / Gcc7.5.0 - Qt5.9.5 - Kf5.44.0)
- Ubuntu 20.04 (Clang10.0.0 / Gcc9.3.0 - Qt5.12.8 - Kf5.68.0)
- Ubuntu 21.04 (Clang12.0.0 / Gcc10.3.0 - Qt5.15.2 - Kf5.80.0)
Expected result:
Default shortcut for Konfigurator is CTRL + SHIFT + ,