cppcheck: fix same expression
cppcheck: fix same expression

[avogadro/qtgui/fileformatdialog.cpp:152] -> [avogadro/qtgui/fileformatdialog.cpp:152]: (style) Same expression on both sides of '&&'.

ghutchis/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,OpenChemistry/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs,OpenChemistry/avogadrolibs,ghutchis/avogadrolibs