Apply go fix modernizations

cmd/deckcolor/main.go

@@ -98,7 +98,7 @@ func main() {
 		draw.Draw(img, img.Bounds(), &image.Uniform{bg}, image.Point{}, draw.Src)
 		charW := font.MeasureString(stripFont, "0").Ceil()
 		pad := 8
-		for e := 0; e < count; e++ {
+		for e := range count {
 			ci := p.Start + e
 			ch := channels[ci]
 			cc := ch.Color
@@ -107,10 +107,7 @@ func main() {
 			valStr := fmt.Sprintf("%03d %02x", ch.Value, ch.Value)
 			nameW := font.MeasureString(stripFont, ch.Name).Ceil()
 			valW := font.MeasureString(stripFont, valStr).Ceil()
-			textW := nameW
-			if valW > textW {
-				textW = valW
-			}
+			textW := max(valW, nameW)
 			x0 := mid - textW/2 - pad
 			x1 := mid + textW/2 + pad
 
@@ -155,8 +152,8 @@ func main() {
 			if i == page {
 				img := image.NewRGBA(image.Rect(0, 0, sz, sz))
 				draw.Draw(img, img.Bounds(), txt, image.Point{}, draw.Src)
-				for y := 0; y < sz; y++ {
-					for x := 0; x < sz; x++ {
+				for y := range sz {
+					for x := range sz {
 						if x < b || x >= sz-b || y < b || y >= sz-b {
 							img.Set(x, y, color.RGBA{255, 255, 255, 255})
 						}