use fira mono subset

had to create a new subset in fontforge, bevy's included font wouldn't load for whatever reason.

src/lib.rs

@@ -416,9 +416,9 @@ pub struct CosmicFontConfig {
 
 impl Default for CosmicFontConfig {
     fn default() -> Self {
-        let fallback_font = include_bytes!("./font/VictorMono-Regular.ttf");
+        let fallback_font = include_bytes!("./font/FiraMono-Regular-subset.ttf");
         Self {
-            load_system_fonts: true,
+            load_system_fonts: false,
             font_bytes: Some(vec![fallback_font]),
             fonts_dir_path: None,
         }