hack: disable dark theme by default

The dark theme doesn't look great when embedded inside OSRD, which
has only a light theme.

Author: emersion

src/app/services/ui/ui.interaction.service.ts

@@ -239,7 +239,7 @@ export class UiInteractionService implements OnDestroy {
     this.loadUserSettingFromLocalStorage();
     if (this.activeTheme === null) {
       // detect at initialization
-      if (window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches) {
+      if (false && window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches) {
         this.setActiveTheme(new ThemeFachDark(), false);
       } else {
         this.setActiveTheme(new ThemeFach(), false);