gui/elm: Extract viewBottomBar from Window.Tray.view
gui/elm: Extract viewBottomBar from Window.Tray.view

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