Fix edge cases and consistency issues

pixstrip-gtk/src/wizard.rs

@@ -49,19 +49,6 @@ impl WizardState {
     pub fn is_last_step(&self) -> bool {
         self.current_step == self.total_steps - 1
     }
-
-    pub fn go_next(&mut self) {
-        if self.can_go_next() {
-            self.current_step += 1;
-            self.visited[self.current_step] = true;
-        }
-    }
-
-    pub fn go_back(&mut self) {
-        if self.can_go_back() {
-            self.current_step -= 1;
-        }
-    }
 }
 
 pub fn build_wizard_pages(state: &AppState) -> Vec<adw::NavigationPage> {