-Wmaybe-uninitialized in ScTable::CopyColFiltered
-Wmaybe-uninitialized in ScTable::CopyColFiltered

apply same initialization as in ScTable::CopyRowFiltered

Change-Id: I9e8de6eaae3b3ad9453e5c06a88cfa93766becd9
Reviewed-on: https://gerrit.libreoffice.org/11263
Reviewed-by: Kohei Yoshida <39dfd368dbdcaa9e11bf8d4b56b10aacad458c7c@kohei.us>
Tested-by: Kohei Yoshida <39dfd368dbdcaa9e11bf8d4b56b10aacad458c7c@kohei.us>

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