Disable default fonts, now M+ displays in Firefox instead of unifont

hosts/desktop.nix

@@ -44,7 +44,9 @@ in
   hardware.pulseaudio.enable = true;
   nixpkgs.config.pulseaudio = true;
 
-  fonts.fonts = with pkgs; [
+  fonts = {
+    enableDefaultFonts = false;
+    fonts = with pkgs; [
       # noto-fonts-cjk doesn't display in Discord for some reason
       # mplus-outline-fonts.osdnRelease is no longer updated and is now mplus-outline-fonts.githubRelease,
       # but で renders weird for some reason in the GitHub release, so I'm sticking to OSDN
@@ -52,4 +54,5 @@ in
       noto-fonts
       (nerdfonts.override { fonts = [ "FiraCode" ]; }) # required for icons
     ];
+  };
 }