qadevOOo: reuse the value of entryName.indexOf(Left Parenthesis)

Change-Id: I1950275af2a063db74fef326ac0dd4e555e5170d
Reviewed-on: https://gerrit.libreoffice.org/11323
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>