WelcomePage: Fix minimum size
WelcomePage: Fix minimum size

The Welcome page should not impose a minimum size on Qt Creator.
We use a ScrollArea instead. This was a regression introduced by porting
to Qt Quick 2.

Task-number: QTCREATORBUG-10505
Change-Id: I5bbe4a18bdb96e91723987995a3632487bab536d
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@digia.com>

darksylinc/qt-creator,farseerri/git_code,farseerri/git_code,farseerri/git_code,martyone/sailfish-qtcreator,xianian/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,xianian/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,omniacreator/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,colede/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,colede/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,danimo/qt-creator,colede/qtcreator,danimo/qt-creator,darksylinc/qt-creator,danimo/qt-creator,maui-packages/qt-creator,farseerri/git_code,Distrotech/qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,darksylinc/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,omniacreator/qtcreator,darksylinc/qt-creator,xianian/qt-creator,maui-packages/qt-creator,colede/qtcreator,darksylinc/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,xianian/qt-creator,danimo/qt-creator,colede/qtcreator,farseerri/git_code,colede/qtcreator,amyvmiwei/qt-creator,Distrotech/qtcreator,omniacreator/qtcreator,xianian/qt-creator,darksylinc/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,omniacreator/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,farseerri/git_code,maui-packages/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,farseerri/git_code,xianian/qt-creator,danimo/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator,maui-packages/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,darksylinc/qt-creator,omniacreator/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator