fix font replacement dialog not being shown when opening doc with missing fonts

git-svn-id: file:///svn/Scribus/trunk/Scribus@19613 11d20701-8431-0410-a711-e3c959e3b870
fix incorrect loading of automatic font substitution option

git-svn-id: file:///svn/Scribus/trunk/Scribus@19614 11d20701-8431-0410-a711-e3c959e3b870