kcountrysubdivisiontest fix "Missing reference in range-for"
Fix clazy issues like "autotests/kcountrysubdivisiontest.cpp:93:14: Missing reference in range-for with non trivial type (KCountrySubdivision) [clazy-range-loop-reference] autotests/kcountrysubdivisiontest.cpp:109:14: Missing reference in range-for with non trivial type (KCountrySubdivision) [clazy-range-loop-reference]".