Move SettingsDialog width override to fixedWidth
Move SettingsDialog width override to fixedWidth

Move the width overrides to the container so it's the same thing
dictating its size as the rest of the dialogs

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk