ui/app,ui/key: move TextInputState from key to internal package

Clients have no need for the TextInputState type.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/key/key.go

@@ -30,20 +30,11 @@ type EditEvent struct {
 
 type Modifiers uint32
 
-type TextInputState uint8
-
 const (
 	ModCommand Modifiers = 1 << iota
 	ModShift
 )
 
-const (
-	TextInputKeep TextInputState = iota
-	TextInputFocus
-	TextInputClose
-	TextInputOpen
-)
-
 const (
 	NameLeftArrow      = '←'
 	NameRightArrow     = '→'