ui/system: move package ui/input/system

Just like the pointer and key packages.

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

ui/app/internal/input/router.go

@@ -7,7 +7,7 @@ import (
 
 	"gioui.org/ui"
 	"gioui.org/ui/input"
-	"gioui.org/ui/input/system"
+	"gioui.org/ui/system"
 	"gioui.org/ui/internal/ops"
 	"gioui.org/ui/key"
 	"gioui.org/ui/pointer"

ui/app/window.go

@@ -13,7 +13,7 @@ import (
 	"gioui.org/ui/app/internal/gpu"
 	iinput "gioui.org/ui/app/internal/input"
 	"gioui.org/ui/input"
-	"gioui.org/ui/input/system"
+	"gioui.org/ui/system"
 	"gioui.org/ui/key"
 )