Fix a regression I introduced with the performance optimizations in commit 899875.
Fix a regression I introduced with the performance optimizations in commit 899875.

If iterating a multiday event which doesn't have a visible start date, start with the first day of the matrix
not it's dtStart().


svn path=/trunk/KDE/kdepim/; revision=920787

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