Remove unused fields flagged by staticcheck

app_shell_test.go

@@ -11,7 +11,6 @@ type appShellProbe struct {
 	collapsed bool
 	toggled   int
 	content   ui.ScrollState
-	side      ui.Rect
 }
 
 func (p *appShellProbe) view(c *ui.Context) {

examples/gallery/pages_display.go

@@ -84,7 +84,6 @@ if mujica.EditableText(c, &name, mujica.EditableTextOptions{Error: saveErr}).Cha
 type headingState struct {
 	level            float64
 	subtitle, divide bool
-	scale            float64
 }
 
 func headingDemo(c *ui.Context, log func(string)) {