app/headless: remove unusued parameters to newContext

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

app/headless/headless.go

@@ -31,7 +31,7 @@ type backend interface {
 
 // NewWindow creates a new headless window.
 func NewWindow(width, height int) (*Window, error) {
-	ctx, err := newContext(width, height)
+	ctx, err := newContext()
 	if err != nil {
 		return nil, err
 	}

app/headless/headless_gl.go

@@ -2,6 +2,6 @@
 
 package headless
 
-func newContext(width, height int) (backend, error) {
+func newContext() (backend, error) {
 	return newGLContext()
 }