Fix connectionsPersistAfterImporting text in tests/variable/variable.cpp.
Fix connectionsPersistAfterImporting text in tests/variable/variable.cpp.

nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml