Apply go fix modernizations

lib/streamdeck/streamdeck.go

@@ -38,13 +38,13 @@ var ModelXL = Model{
 }
 
 var ModelPlus = Model{
-	Name:     "Plus",
-	Keys:     8,
-	KeyRows:  2,
-	KeyCols:  4,
-	KeySize:  120,
-	Encoders: 4,
-	LCDWidth: 800,
+	Name:      "Plus",
+	Keys:      8,
+	KeyRows:   2,
+	KeyCols:   4,
+	KeySize:   120,
+	Encoders:  4,
+	LCDWidth:  800,
 	LCDHeight: 100,
 }
 
@@ -101,10 +101,10 @@ func OpenModel(m *Model) (*Device, error) {
 	return &Device{dev: dev, model: m}, nil
 }
 
-func (d *Device) Model() *Model     { return d.model }
-func (d *Device) Close() error      { return d.dev.Close() }
+func (d *Device) Model() *Model        { return d.model }
+func (d *Device) Close() error         { return d.dev.Close() }
 func (d *Device) SerialNumber() string { return d.dev.SerialNumber() }
-func (d *Device) Product() string    { return d.dev.Product() }
+func (d *Device) Product() string      { return d.dev.Product() }
 
 func (d *Device) FirmwareVersion() (string, error) {
 	buf, err := d.dev.GetFeatureReport(5)
@@ -150,8 +150,8 @@ func (d *Device) SetKeyImage(key int, img image.Image) error {
 	var src image.Image = scaled
 	if d.model.FlipKeys {
 		flipped := image.NewRGBA(scaled.Bounds())
-		for y := 0; y < sz; y++ {
-			for x := 0; x < sz; x++ {
+		for y := range sz {
+			for x := range sz {
 				flipped.Set(sz-1-x, sz-1-y, scaled.At(x, y))
 			}
 		}

lib/streamdeck/text.go

@@ -108,11 +108,11 @@ type TextSpan struct {
 func DrawOutlinedSpans(img *image.RGBA, face font.Face, defaultOutline color.Color, thickness int, lines ...[]TextSpan) {
 	var full []string
 	for _, line := range lines {
-		s := ""
+		var s strings.Builder
 		for _, span := range line {
-			s += span.Text
+			s.WriteString(span.Text)
 		}
-		full = append(full, s)
+		full = append(full, s.String())
 	}
 
 	metrics := face.Metrics()