Remove BackButton in first BaseFileWizard page.
Remove BackButton in first BaseFileWizard page.

After selecting a template in the NewFileDialog (Strg+N), a BaseFileWizard is started with an unusable BackButton.
This change removes the Button on first wizardpage.

KDE/android-qt-creator,martyone/sailfish-qtcreator,bakaiadam/collaborative_qt_creator,xianian/qt-creator,KDE/android-qt-creator,syntheticpp/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,farseerri/git_code,yinyunqiao/qtcreator,enricoros/k-qt-creator-inspector,enricoros/k-qt-creator-inspector,ostash/qt-creator-i18n-uk,maui-packages/qt-creator,enricoros/k-qt-creator-inspector,richardmg/qtcreator,AltarBeastiful/qt-creator,jonnor/qt-creator,richardmg/qtcreator,bakaiadam/collaborative_qt_creator,yinyunqiao/qtcreator,richardmg/qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,duythanhphan/qt-creator,danimo/qt-creator,KDE/android-qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,maui-packages/qt-creator,dmik/qt-creator-os2,darksylinc/qt-creator,Distrotech/qtcreator,omniacreator/qtcreator,farseerri/git_code,duythanhphan/qt-creator,colede/qtcreator,malikcjm/qtcreator,colede/qtcreator,ostash/qt-creator-i18n-uk,syntheticpp/qt-creator,xianian/qt-creator,danimo/qt-creator,omniacreator/qtcreator,xianian/qt-creator,azat/qtcreator,renatofilho/QtCreator,richardmg/qtcreator,danimo/qt-creator,KDE/android-qt-creator,pcacjr/qt-creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,kuba1/qtcreator,ostash/qt-creator-i18n-uk,darksylinc/qt-creator,ostash/qt-creator-i18n-uk,bakaiadam/collaborative_qt_creator,kuba1/qtcreator,martyone/sailfish-qtcreator,xianian/qt-creator,darksylinc/qt-creator,enricoros/k-qt-creator-inspector,ostash/qt-creator-i18n-uk,danimo/qt-creator,farseerri/git_code,malikcjm/qtcreator,darksylinc/qt-creator,colede/qtcreator,jonnor/qt-creator,farseerri/git_code,colede/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,malikcjm/qtcreator,syntheticpp/qt-creator,xianian/qt-creator,pcacjr/qt-creator,AltarBeastiful/qt-creator,malikcjm/qtcreator,renatofilho/QtCreator,KDE/android-qt-creator,syntheticpp/qt-creator,yinyunqiao/qtcreator,syntheticpp/qt-creator,azat/qtcreator,danimo/qt-creator,yinyunqiao/qtcreator,KDAB/KDAB-Creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,AltarBeastiful/qt-creator,duythanhphan/qt-creator,xianian/qt-creator,jonnor/qt-creator,yinyunqiao/qtcreator,hdweiss/qt-creator-visualizer,pcacjr/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,richardmg/qtcreator,KDE/android-qt-creator,colede/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,enricoros/k-qt-creator-inspector,KDE/android-qt-creator,sandsmark/qtcreator-minimap,malikcjm/qtcreator,yinyunqiao/qtcreator,sandsmark/qtcreator-minimap,amyvmiwei/qt-creator,Distrotech/qtcreator,syntheticpp/qt-creator,duythanhphan/qt-creator,danimo/qt-creator,farseerri/git_code,darksylinc/qt-creator,hdweiss/qt-creator-visualizer,hdweiss/qt-creator-visualizer,hdweiss/qt-creator-visualizer,renatofilho/QtCreator,amyvmiwei/qt-creator,maui-packages/qt-creator,azat/qtcreator,darksylinc/qt-creator,dmik/qt-creator-os2,dmik/qt-creator-os2,maui-packages/qt-creator,ostash/qt-creator-i18n-uk,duythanhphan/qt-creator,malikcjm/qtcreator,AltarBeastiful/qt-creator,renatofilho/QtCreator,maui-packages/qt-creator,syntheticpp/qt-creator,farseerri/git_code,KDAB/KDAB-Creator,danimo/qt-creator,xianian/qt-creator,darksylinc/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,dmik/qt-creator-os2,Distrotech/qtcreator,enricoros/k-qt-creator-inspector,jonnor/qt-creator,martyone/sailfish-qtcreator,KDAB/KDAB-Creator,farseerri/git_code,KDAB/KDAB-Creator,Distrotech/qtcreator,renatofilho/QtCreator,hdweiss/qt-creator-visualizer,renatofilho/QtCreator,bakaiadam/collaborative_qt_creator,azat/qtcreator,hdweiss/qt-creator-visualizer,azat/qtcreator,jonnor/qt-creator,martyone/sailfish-qtcreator,sandsmark/qtcreator-minimap,xianian/qt-creator,kuba1/qtcreator,azat/qtcreator,colede/qtcreator,dmik/qt-creator-os2,sandsmark/qtcreator-minimap,jonnor/qt-creator,richardmg/qtcreator,danimo/qt-creator,malikcjm/qtcreator,sandsmark/qtcreator-minimap,omniacreator/qtcreator,farseerri/git_code,kuba1/qtcreator,pcacjr/qt-creator,Distrotech/qtcreator,KDAB/KDAB-Creator,pcacjr/qt-creator,amyvmiwei/qt-creator,pcacjr/qt-creator,dmik/qt-creator-os2,colede/qtcreator,amyvmiwei/qt-creator,Distrotech/qtcreator,dmik/qt-creator-os2,omniacreator/qtcreator,sandsmark/qtcreator-minimap,richardmg/qtcreator,omniacreator/qtcreator,omniacreator/qtcreator,KDAB/KDAB-Creator,bakaiadam/collaborative_qt_creator,kuba1/qtcreator,Distrotech/qtcreator,KDE/android-qt-creator,AltarBeastiful/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,yinyunqiao/qtcreator,amyvmiwei/qt-creator,bakaiadam/collaborative_qt_creator,ostash/qt-creator-i18n-uk,martyone/sailfish-qtcreator,kuba1/qtcreator,enricoros/k-qt-creator-inspector,pcacjr/qt-creator,maui-packages/qt-creator,bakaiadam/collaborative_qt_creator