bug fix in BATundo, hash changes weren't undone for simple typed bats
bug fix in BATundo, hash changes weren't undone for simple typed bats

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb