fix: 修复次要主题色（暗色模式）相关问题 #1308

Author: ShirosakiMio

FCL/src/main/java/com/tungsten/fcl/ui/setting/LauncherSettingPage.java

@@ -393,7 +393,7 @@ public void onNegative(int initColor) {
             dialog.show();
         }
         if (v == theme2) {
-            FCLColorPickerDialog dialog = new FCLColorPickerDialog(getContext(), ThemeEngine.getInstance().getTheme().getColor2(), new FCLColorPickerDialog.Listener() {
+            FCLColorPickerDialog dialog = new FCLColorPickerDialog(getContext(), ThemeEngine.getInstance().getTheme()._getColor2(), new FCLColorPickerDialog.Listener() {
                 @Override
                 public void onColorChanged(int color) {
                     ThemeEngine.getInstance().applyColor2(color);

FCLLibrary/src/main/java/com/tungsten/fcllibrary/component/theme/Theme.java

@@ -67,6 +67,9 @@ public int getColor2() {
         return isNightMode ? color2Dark.get() : color2.get();
     }
 
+    public int _getColor2() {
+        return color2.get();
+    }
     public int getColor2Dark() {
         return color2Dark.get();
     }
@@ -221,7 +224,7 @@ public static void saveTheme(Context context, Theme theme) {
         sharedPreferences = context.getSharedPreferences("theme", MODE_PRIVATE);
         editor = sharedPreferences.edit();
         editor.putInt("theme_color", theme.getColor());
-        editor.putInt("theme_color2", theme.getColor2());
+        editor.putInt("theme_color2", theme._getColor2());
         editor.putInt("theme_color2_dark", theme.getColor2Dark());
         editor.putBoolean("fullscreen", theme.isFullscreen());
         editor.putInt("animation_speed", theme.getAnimationSpeed());