widget: Fix missing braces
widget: Fix missing braces

Tracking the selection also only makes sense on the active screen,
so add the braces as the indentation already suggests.

Thanks, -Wmisleading-indentation !

thestinger/vte-ng,thestinger/vte-ng,saitoha/vte-sixel,saitoha/vte-sixel,thestinger/vte-ng,saitoha/vte-sixel