Bug #672595: After creation of a new book, make sure to set it to dirty so that a cancelled save_as dialog leaves the book dirty.

The missing part was the line in assistant-hierarchy.c, but I've added
it to the two other calls to file_access_for_save_as() to be on the safe
side on those two other book creation places as well.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23053 57a11ea4-9604-0410-9ed3-97b8803252fd