restore behaviour after OUString changes
restore behaviour after OUString changes

in commit ab0806e183fcdc8b2e4eca2d29b877a41f3ded8b,
"convert sd/.../fuinsfil.hxx from String to OUString"
my OUString conversion changed the behaviour of the
x.Erase(x.Search()) operations.

Change-Id: I0f7f342eb4caf277fe62c3c11d1aa2c74290e549

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