backport SVN commit 1102436 by winterz
backport SVN commit 1102436 by winterz

make the timeoffset spinbox allow only 5 digits, just like when
setting a simple reminder.
kolab/issue4207

svn path=/branches/KDE/4.4/kdepim/; revision=1102439

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi