Fix customized extesion in Style Configurator not saved regression #106

Job	Run time
build_windows_cmake (Release, x64, amd64)	4m 16s
build_windows_msys2 (Release, x86_64)	5m 0s
build_windows (Release, x64)	3m 50s
build_windows_msys2 (Release, i686)	4m 51s
build_windows (Release, Win32)	3m 36s
build_windows_msys2 (Debug, x86_64)	4m 39s
build_windows (Release, ARM64)	4m 8s
build_windows_msys2 (Debug, i686)	3m 58s
build_windows (Debug, x64)	6m 27s
build_windows (Debug, Win32)	4m 48s
build_windows (Debug, ARM64)	3m 26s
	48m 59s

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