sync in view branch updates the view branch

* sync: When run in a view branch, refresh the view branch to reflect any
    changes that have been made to the parent branch or metadata.

This is basically working, but probably needs some more work to deal with
all the edge cases of things sync does.

Sponsored-by: Lawrence Brogan on Patreon

Command/View.hs

@@ -35,7 +35,7 @@ start [] = giveup "Specify metadata to include in view"
 start ps = ifM safeToEnterView
 	( do
 		view <- mkView ps
-		go view  =<< currentView
+		go view =<< currentView
 	, giveup "Not safe to enter view."
 	)
   where