Don't ask to adjust the Screen Scaling

For the default theme it makes sense (and maybe for most theme
variants it will make sense to avoid adjusting the screen
scaling). But maybe other themes will want to adjust the scale
automatically when choosing the variant.

src/app/commands/cmd_options.cpp

@@ -227,7 +227,8 @@ class OptionsWindow : public app::gen::Options {
     }
   private:
     void onClick() override {
-      m_options->setUITheme(m_themeId, true,
+      m_options->setUITheme(m_themeId,
+                            false,  // Don't adjust scale
                             false); // Don't recreate variants
     }
     OptionsWindow* m_options;