Increase defaultDelayAfterChange to 2s (compiler-explorer#6703)

<!-- THIS COMMENT IS INVISIBLE IN THE FINAL PR, BUT FEEL FREE TO REMOVE
IT
Thanks for taking the time to improve CE. We really appreciate it.
Before opening the PR, please make sure that the tests & linter pass
their checks,
  by running `make check`.
In the best case scenario, you are also adding tests to back up your
changes,
  but don't sweat it if you don't. We can discuss them at a later date.
Feel free to append your name to the CONTRIBUTORS.md file
Thanks again, we really appreciate this!
-->

static/settings.ts

@@ -212,7 +212,7 @@ export class Settings {
     // The delay between a change and re-compilation is a substantial factor in site traffic load.
     // We want to be able to control it centrally - but only for users that didn't explicitly set it.
     // This is the place.
-    private defaultDelayAfterChange = 1500;
+    private defaultDelayAfterChange = 2000;
 
     constructor(
         hub: Hub,