fix printing writable mesh formats in for_format()
fix printing writable mesh formats in for_format()

sfepy/sfepy,rc/sfepy,BubuLK/sfepy,BubuLK/sfepy,rc/sfepy,BubuLK/sfepy,lokik/sfepy,vlukes/sfepy,sfepy/sfepy,vlukes/sfepy,lokik/sfepy,vlukes/sfepy,lokik/sfepy,rc/sfepy,lokik/sfepy,sfepy/sfepy