all: run goimports

gioui.org/ui was renamed from gioui.org/ui/ui before the release,
but the import order wasn't changed accordingly.

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

ui/draw/draw.go

@@ -6,9 +6,9 @@ import (
 	"image"
 	"math"
 
+	"gioui.org/ui"
 	"gioui.org/ui/f32"
 	"gioui.org/ui/internal/path"
-	"gioui.org/ui"
 )
 
 type OpImage struct {

ui/draw/path.go

@@ -5,9 +5,9 @@ package draw
 import (
 	"math"
 
+	"gioui.org/ui"
 	"gioui.org/ui/f32"
 	"gioui.org/ui/internal/path"
-	"gioui.org/ui"
 )
 
 type OpClip struct {