fdo#62094 - fix infinite loop in radio button group iteration.
fdo#62094 - fix infinite loop in radio button group iteration.

Simplify the code too - we copy the vector anyway, so reversing it
should be cheap.

Change-Id: Ie655ba3044c7e0dd5a15b0e839a3712a32a1e298

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core