Update to the latest gowid

This features some fixes to the dialog widget, and also a generalization
of the callback structure for dialogs. That means I need to adjust the
dialogs created by termshark.

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/gcla/deep v1.0.2
-	github.com/gcla/gowid v1.2.1-0.20210226035546-9f222831a393
+	github.com/gcla/gowid v1.2.1-0.20210403174333-badb5d3b9c2e
 	github.com/gcla/tail v1.0.1-0.20190505190527-650e90873359
 	github.com/gdamore/tcell v1.3.1-0.20200115030318-bff4943f9a29
 	github.com/go-test/deep v1.0.2 // indirect
@@ -18,7 +18,7 @@ require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/magiconair/properties v1.8.4 // indirect
 	github.com/mattn/go-isatty v0.0.12
-	github.com/mitchellh/go-homedir v1.0.0
+	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mitchellh/mapstructure v1.4.0 // indirect
 	github.com/mreiferson/go-snappystream v0.2.3
 	github.com/pelletier/go-toml v1.8.1 // indirect