Add button mapping for Left, Back, Confirm, Right (#173)

## Summary

* Add button mapping for Left, Back, Confirm, Right for front buttons

## Additional Context

* Asked for in
https://github.com/daveallie/crosspoint-reader/discussions/78#discussioncomment-15375326

src/activities/settings/SettingsActivity.cpp

@@ -23,7 +23,7 @@ const SettingInfo settingsList[settingsCount] = {
     {"Front Button Layout",
      SettingType::ENUM,
      &CrossPointSettings::frontButtonLayout,
-     {"Bck, Cnfrm, Lft, Rght", "Lft, Rght, Bck, Cnfrm"}},
+     {"Bck, Cnfrm, Lft, Rght", "Lft, Rght, Bck, Cnfrm", "Lft, Bck, Cnfrm, Rght"}},
     {"Side Button Layout (reader)",
      SettingType::ENUM,
      &CrossPointSettings::sideButtonLayout,
@@ -172,11 +172,6 @@ void SettingsActivity::render() const {
   for (int i = 0; i < settingsCount; i++) {
     const int settingY = 60 + i * 30;  // 30 pixels between settings
 
-    // Draw selection indicator for the selected setting
-    if (i == selectedSettingIndex) {
-      renderer.drawText(UI_10_FONT_ID, 5, settingY, ">");
-    }
-
     // Draw setting name
     renderer.drawText(UI_10_FONT_ID, 20, settingY, settingsList[i].name, i != selectedSettingIndex);