fix wasm breaking when using plugin defaults

may be a better way than bundling a font, bit unsure

src/lib.rs

@@ -416,9 +416,10 @@ pub struct CosmicFontConfig {
 
 impl Default for CosmicFontConfig {
     fn default() -> Self {
+        let fallback_font = include_bytes!("./font/VictorMono-Regular.ttf");
         Self {
             load_system_fonts: true,
-            font_bytes: None,
+            font_bytes: Some(vec![fallback_font]),
             fonts_dir_path: None,
         }
     }