Custom font not applying

Hi there,

I am trying out eframe/egui for the first time (thanks for all the docs and examples!).

I'm following the [custom font example](https://github.com/emilk/egui/blob/master/examples/custom_font/src/main.rs) to add a custom font to my own eframe app, but my custom font is not applying. I'm guessing that I'm making a simple mistake. [PR here](https://github.com/pmillspaugh/stickies/pull/2/files), and here's the code I added to the `new` fn in my app struct impl in `app.rs`:

```rs
let mut fonts = egui::FontDefinitions::default();

fonts.font_data.insert(
"EBGaramond".to_owned(),
egui::FontData::from_static(include_bytes!("../assets/EBGaramond-Regular.ttf"))
);

fonts.families.entry(egui::FontFamily::Proportional).or_default().insert(0,"EBGaramond".to_owned());
fonts.families.entry(egui::FontFamily::Monospace).or_default().insert(0,"EBGaramond".to_owned());

cc.egui_ctx.set_fonts(fonts);
```

I also tried removing the [`default_fonts` feature in Cargo.toml](https://github.com/pmillspaugh/stickies/blob/main/Cargo.toml#L17) to break fonts altogether, but my app still built and ran.

Thank you.