gui/elm: Remove useless Svg* import in Welcome
gui/elm: Remove useless Svg* import in Welcome

nono/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop